From b8c772269cf2337a462cb3234ab40e7dead5e85c Mon Sep 17 00:00:00 2001
From: Amit Haridas <amit.wh@gmail.com>
Date: Mon, 14 Sep 2026 19:14:30 +0530
Subject: [PATCH] docs(plans): add ascii-art-upgrade implementation plan
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12-task TDD plan for the full-fledged ASCII Art Generator upgrade:

* T1: add figlet npm dep
* T2: extract + extend 17 hand-coded font tables + snapshot tests
* T3: extract 19 templates + snapshot tests
* T4: figlet adapter (lazy-load + cache + structured error)
* T5: pure AsciiArt orchestrator (generate/listFonts/getFontMeta)
* T6: IPC handler wiring in main.js via existing JSON store helper
* T7: preload allow-list cleanup (drop dead show-ascii-generator*
      channels, add new ascii:* invoke channels)
* T8: preload allow-list assertion test
* T9: renderer controller (src/renderer/ascii-controller.js)
* T10: standalone window HTML rewrite with searchable font picker,
       Copy/Save buttons, controller script tag
* T11: delete in-app modal (#ascii-art-dialog, renderer.js:5942-6736,
       dead asciiModal, dead preload receive channels)
* T12: README + final lint/format/test/build sweep

Spec gap handled inline: §5 headless Electron integration test deferred
to manual smoke check (spec itself says skip if no display available).

Amit Haridas
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 create mode 100644 docs/superpowers/plans/2026-09-14-ascii-art-upgrade.md

diff --git a/docs/superpowers/plans/2026-09-14-ascii-art-upgrade.md b/docs/superpowers/plans/2026-09-14-ascii-art-upgrade.md
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+# ASCII Art Generator Upgrade Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Promote the ASCII Art Generator from a partially-dual-implemented 5-font feature to a single-source-of-truth, 17 hand-coded + 400+ FIGlet font feature with insert / copy / save output destinations and full test coverage.
+**Architecture:** Extract the algorithm from `renderer.js:5942-6736` into a pure `src/main/AsciiArt.js` module that mirrors the `DocQA`/`DailyNotes` pattern. Hand-coded font tables move into `src/main/AsciiArt.fonts.js`; templates into `src/main/AsciiArt.templates.js`; `figlet` becomes a lazy-loaded `src/main/AsciiArt.figlet-adapter.js`. A new `src/renderer/ascii-controller.js` drives the existing standalone `src/ascii-generator.html` window. The in-app modal (`#ascii-art-dialog`, `showASCIIGenerator*`, `preload.js` receive channels) is deleted; the standalone window remains the only path. `electron-store` `ascii:lastFont` (via the existing `store` JSON helper in `main.js:267-289`) remembers the last-used font.
+**Tech Stack:** Electron 41.10.7 · electron-builder 26.15.3 · vanilla CommonJS · `figlet@^1.8.0` (pure JS) · Jest + jsdom · ESLint flat config · Prettier (2-space, single quotes, semicolons, 100-col).
+**Spec:** docs/superpowers/specs/2026-09-14-ascii-art-upgrade-design.md
+
+## Global Constraints
+
+- Electron 41.10.7, electron-builder 26.15.3
+- Vanilla JS, no bundler. Pure modules in `src/main/`, IPC wired in `src/main.js`
+- Preload allow-list at `src/preload.js` for any new IPC channels (`invoke` reuses `ALLOWED_SEND_CHANNELS`; `on` uses `ALLOWED_RECEIVE_CHANNELS`)
+- Tests: Jest + jsdom. Run `npm test`, `npm run lint`, `npm run format:check`
+- Single ASCII art path: standalone `BrowserWindow` only; in-app modal `#ascii-art-dialog` and dead channels `show-ascii-generator*` deleted
+- New dep: `figlet` npm package (latest 1.x, pure JS, ~400 KB unpacked)
+- Hand-coded font count: 17 (5 existing + 12 new) — big, small, lean, slant, isometric1-4, 3-d, 3x5, ansi-shadow, calvin-s
+- New settings key: `ascii:lastFont` (via the existing `store` JSON helper in `main.js:267-289`)
+- Output destinations: insert at cursor (existing, fenced code block wrapper) + copy to clipboard + save to file
+- The standalone `src/ascii-generator.html` (751 lines) keeps its layout but its controller moves to a new `src/renderer/ascii-controller.js`
+- Snapshot tests normalize line endings to `\n` and trim trailing whitespace
+- TDD discipline: every component starts with a failing test
+
+## File Structure
+
+### Created
+- `src/main/AsciiArt.fonts.js` — 17 hand-coded font tables (`HAND_CODED_FONTS`).
+- `src/main/AsciiArt.templates.js` — 19 named ASCII templates (`ASCII_TEMPLATES`).
+- `src/main/AsciiArt.figlet-adapter.js` — Lazy `require('figlet')` + `fontsSync()` cache + `textSync(text, font)` wrapper + structured error.
+- `src/main/AsciiArt.js` — Pure orchestrator: `generate({ text, font, options })`, `listFonts()`, `getFontMeta(id)`.
+- `src/renderer/ascii-controller.js` — Renderer-side controller for the standalone window.
+- `tests/main/ascii-art.test.js` — Unit tests for `generate` / `listFonts` / `getFontMeta` / figlet adapter.
+- `tests/main/ascii-art.fonts.test.js` — Snapshot tests per hand-coded font (HELLO + edge cases).
+- `tests/main/ascii-art.templates.test.js` — Snapshot tests per template.
+- `tests/main/ascii-art.figlet-adapter.test.js` — Adapter tests with `figlet` mocked.
+- `tests/preload-ascii.test.js` — Allow-list assertions for new `ascii:*` channels.
+
+### Modified
+- `package.json` — Add `"figlet": "^1.8.0"` to `dependencies`.
+- `src/main.js:4005-4010` — Add `const AsciiArt = require('./main/AsciiArt');` after DocQA require.
+- `src/main.js` (after line 5611, near other recent IPC handler blocks) — Register `ascii:generate`, `ascii:list-fonts`, `ascii:get-font-meta`, `ascii:save`, `ascii:copy`, `ascii:last-font` handlers.
+- `src/preload.js:98-99,294-296` — Delete dead receive channels `show-ascii-generator` and `show-ascii-generator-window`. Add new invoke channels `ascii:generate`, `ascii:list-fonts`, `ascii:get-font-meta`, `ascii:save`, `ascii:copy`, `ascii:last-font` to `ALLOWED_SEND_CHANNELS`. Add `generators.ascii.*` namespace helpers.
+- `src/renderer.js:2188` — Delete `const asciiModal = new ModalManager('#ascii-art-dialog');`.
+- `src/renderer.js:2202` — Delete `asciiModal` entry from `window.modals`.
+- `src/renderer.js:5942-6736` — Delete entire in-app modal block.
+- `src/index.html:812-1028` — Delete entire `#ascii-art-dialog` modal markup.
+- `src/ascii-generator.html` — Rewrite inline `<script>` block to call `src/renderer/ascii-controller.js` instead of inlining FONTS / TEMPLATES / BOX_STYLES; replace `font-style` `<select>` with a searchable font picker; add "Copy to Clipboard" and "Save to File" buttons.
+- `README.md:56` — Update ASCII Art Generator row to mention 17 hand-coded + 400+ FIGlet fonts and copy/save/insert destinations.
+- `tests/preload.test.js` — Add new `ascii:*` channels to `EXPECTED_SEND_CHANNELS` (or keep `preload-ascii.test.js` as the authoritative allow-list test).
+
+### Unchanged
+- `src/main.js:5584-5611` (`openAsciiGenerator`) — standalone window creation unchanged.
+- `src/main.js:5609-5611` (`'open-ascii-generator'` ipcMain.on) — unchanged.
+- `README.md:125` (Ctrl+Shift+A shortcut) — unchanged.
+
+---
+
+### Task 1: Add `figlet` dependency and verify install
+
+**Files:**
+- Modify: `package.json:58-95` (dependencies section)
+
+**Interfaces:**
+- Consumes: nothing (greenfield dep)
+- Produces: `figlet` package resolvable via `require('figlet')` from any pure module.
+
+- [ ] **Step 1: Add `figlet` to `package.json` dependencies.** Edit the `dependencies` object in `package.json` and insert `"figlet": "^1.8.0",` alphabetically (after `ffmpeg-static`). Run `npm install --save figlet@^1.8.0` so the lockfile updates too.
+- [ ] **Step 2: Verify the install is pure JS.** Run `npm ls figlet` and confirm the output lists `figlet@1.x` with no native dependencies (no `node-gyp`-built modules). Run `node -e "const f = require('figlet'); console.log(typeof f.textSync, typeof f.fontsSync)"` from `/mnt/source/apps/parallel-git-branch-dev/markdown-converter__master` and confirm `function function` is printed.
+- [ ] **Step 3: Commit.** `git add package.json package-lock.json && git commit -m "chore(deps): add figlet ^1.8.0 for ASCII art generator"`
+
+---
+
+### Task 2: Create hand-coded font tables module
+
+**Files:**
+- Create: `src/main/AsciiArt.fonts.js`
+- Test: `tests/main/ascii-art.fonts.test.js`
+
+**Interfaces:**
+- Consumes: nothing (pure data module)
+- Produces: `HAND_CODED_FONTS` — `{ [id]: { height, chars: { [A-Z0-9 ' ']: string[height] } } }` for the 5 existing + 12 new fonts.
+
+- [ ] **Step 1: Write the failing snapshot test.** Create `tests/main/ascii-art.fonts.test.js` with the following content (it will fail because the module does not exist yet):
+
+```js
+/**
+ * @jest-environment node
+ *
+ * Per-font snapshot tests for the 17 hand-coded ASCII art fonts. Snapshots
+ * are the safety net that catches drift when the font tables are hand-edited.
+ * Line endings are normalized to \n and trailing whitespace is trimmed so
+ * editor auto-trim does not produce spurious diffs.
+ */
+const AsciiArtFonts = require('../../src/main/AsciiArt.fonts');
+
+const FONT_IDS = Object.freeze([
+  // 5 existing
+  'standard',
+  'banner',
+  'block',
+  'bubble',
+  'digital',
+  // 12 new
+  'big',
+  'small',
+  'lean',
+  'slant',
+  'isometric1',
+  'isometric2',
+  'isometric3',
+  'isometric4',
+  'three-d',
+  'three-x-five',
+  'ansi-shadow',
+  'calvin-s',
+]);
+
+const normalize = (s) => s.replace(/\r\n/g, '\n').replace(/[ \t]+\n/g, '\n');
+
+describe('AsciiArt.fonts table shape', () => {
+  test.each(FONT_IDS)('%s has height and chars for A-Z 0-9 and space', (id) => {
+    const font = AsciiArtFonts.HAND_CODED_FONTS[id];
+    expect(font).toBeDefined();
+    expect(typeof font.height).toBe('number');
+    expect(font.height).toBeGreaterThanOrEqual(4);
+    expect(font.height).toBeLessThanOrEqual(8);
+    expect(typeof font.chars).toBe('object');
+    for (const ch of 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 '.split('')) {
+      expect(font.chars[ch]).toBeDefined();
+      expect(font.chars[ch]).toHaveLength(font.height);
+      for (const line of font.chars[ch]) {
+        expect(typeof line).toBe('string');
+      }
+    }
+  });
+});
+
+describe('AsciiArt.fonts HELLO snapshot per font', () => {
+  test.each(FONT_IDS)('%s', (id) => {
+    const font = AsciiArtFonts.HAND_CODED_FONTS[id];
+    const lines = Array(font.height).fill('');
+    for (const ch of 'HELLO') {
+      const glyph = font.chars[ch] || font.chars[' '];
+      for (let i = 0; i < font.height; i++) lines[i] += glyph[i];
+    }
+    expect(normalize(lines.join('\n'))).toMatchSnapshot();
+  });
+});
+
+describe('AsciiArt.fonts edge cases', () => {
+  test('unknown character falls back to space glyph (preserves column width)', () => {
+    const font = AsciiArtFonts.HAND_CODED_FONTS.standard;
+    const fallback = font.chars[' '];
+    const unknown = font.chars['é'];
+    expect(unknown).toEqual(fallback);
+  });
+
+  test('all digit glyphs exist for standard', () => {
+    const font = AsciiArtFonts.HAND_CODED_FONTS.standard;
+    for (const d of '0123456789') {
+      expect(font.chars[d]).toBeDefined();
+      expect(font.chars[d]).toHaveLength(font.height);
+    }
+  });
+});
+```
+
+- [ ] **Step 2: Run test, verify it fails.** `npm test -- tests/main/ascii-art.fonts.test.js` — expect `Cannot find module '../../src/main/AsciiArt.fonts'`.
+- [ ] **Step 3: Create the font tables module with the 5 existing fonts.** Create `src/main/AsciiArt.fonts.js` and export `HAND_CODED_FONTS` containing the 5 existing tables (`standard`, `banner`, `block`, `bubble`, `digital`) extracted from `src/renderer.js:6005-6474` and the 4-font subset that already exists in `src/ascii-generator.html:366-594`. Heights: standard=5, banner=7, block=6, bubble=5, digital=7. Use this header:
+
+```js
+/**
+ * Hand-coded ASCII art font tables — 17 fonts total.
+ *
+ * Each font is `{ height, chars }` where `chars[letter]` is a `string[]` of
+ * exactly `height` rows. Every A-Z, 0-9 and ' ' must be defined; missing
+ * glyphs fall back to space (see tests). The 5 existing fonts are extracted
+ * from renderer.js:6005-6474; the 12 new fonts mirror figlet 1.x reference
+ * output.
+ *
+ * @module AsciiArt.fonts
+ */
+'use strict';
+
+const HAND_CODED_FONTS = {
+  standard: { /* paste from renderer.js:6008-6048 */ },
+  banner:   { /* paste from renderer.js:6050-6386 */ },
+  block:    { /* paste from renderer.js:6388-6401 */ },
+  bubble:   { /* paste from renderer.js:6403-6410 */ },
+  digital:  { /* paste from renderer.js:6412-6419 */ },
+  // 12 new fonts follow
+};
+
+module.exports = { HAND_CODED_FONTS };
+```
+
+- [ ] **Step 4: Run test for the 5 existing fonts.** `npm test -- tests/main/ascii-art.fonts.test.js` — all 5 snapshot tests should now pass (the 12 new ones still fail).
+- [ ] **Step 5: Author the 12 new font tables.** For each of `big` (h=8), `small` (h=5), `lean` (h=6), `slant` (h=6), `isometric1`-`isometric4` (h=6), `three-d` (h=7), `three-x-five` (h=5), `ansi-shadow` (h=8), `calvin-s` (h=7), port the canonical figlet reference output. Add each to `HAND_CODED_FONTS` in the module. Every char must have exactly `height` rows. Use figlet's bundled `.flf` files as ground truth — fetch them with `node -e "const f=require('figlet'); console.log(f.textSync('HELLO',{font:'Big'}))"` and copy the output verbatim.
+- [ ] **Step 6: Run full font tests.** `npm test -- tests/main/ascii-art.fonts.test.js` — expect all 17 snapshot tests plus the shape and edge-case tests to pass. Review the generated `tests/main/__snapshots__/ascii-art.fonts.test.js.snap` file and visually verify each block's first row looks correct. If any are wrong, fix the table and re-run.
+- [ ] **Step 7: Commit.** `git add src/main/AsciiArt.fonts.js tests/main/ascii-art.fonts.test.js tests/main/__snapshots__/ && git commit -m "feat(ascii-art): 17 hand-coded font tables (5 existing + 12 new) with snapshot tests"`
+
+---
+
+### Task 3: Create the templates module
+
+**Files:**
+- Create: `src/main/AsciiArt.templates.js`
+- Test: `tests/main/ascii-art.templates.test.js`
+
+**Interfaces:**
+- Consumes: nothing (pure data module)
+- Produces: `ASCII_TEMPLATES` — `{ [name]: string }` for the 19 named templates; `getTemplate(name)` accessor that returns `''` for unknown names.
+
+- [ ] **Step 1: Write the failing snapshot test.** Create `tests/main/ascii-art.templates.test.js`:
+
+```js
+/**
+ * @jest-environment node
+ *
+ * Per-template snapshot tests. Templates are static strings; the snapshot
+ * catches accidental edits during refactors.
+ */
+const AsciiArtTemplates = require('../../src/main/AsciiArt.templates');
+
+const TEMPLATE_NAMES = [
+  'arrow-right',
+  'arrow-down',
+  'arrow-up',
+  'decision',
+  'process',
+  'flowchart',
+  'sequence',
+  'network',
+  'hierarchy',
+  'header',
+  'note',
+  'warning',
+  'info',
+  'divider',
+  'separator',
+  'banner',
+  'checklist',
+  'progress-bar',
+  'table-simple',
+];
+
+describe('AsciiArt.templates', () => {
+  test.each(TEMPLATE_NAMES)('%s', (name) => {
+    expect(AsciiArtTemplates.getTemplate(name)).toMatchSnapshot();
+  });
+
+  test('returns empty string for unknown name', () => {
+    expect(AsciiArtTemplates.getTemplate('nope')).toBe('');
+  });
+
+  test('ASCII_TEMPLATES object exposes all 19 names', () => {
+    expect(Object.keys(AsciiArtTemplates.ASCII_TEMPLATES).sort()).toEqual(
+      TEMPLATE_NAMES.slice().sort()
+    );
+  });
+});
+```
+
+- [ ] **Step 2: Run test, verify it fails.** `npm test -- tests/main/ascii-art.templates.test.js` — expect `Cannot find module`.
+- [ ] **Step 3: Create the templates module.** Create `src/main/AsciiArt.templates.js` exporting `ASCII_TEMPLATES` (the merged superset of `src/renderer.js:6517-6670` and `src/ascii-generator.html:596-626`) and `getTemplate(name)`:
+
+```js
+/**
+ * ASCII art templates — named pre-drawn diagrams and frames.
+ *
+ * Sourced from renderer.js:6517-6670 and src/ascii-generator.html:596-626.
+ * 19 entries; unknown names resolve to ''.
+ *
+ * @module AsciiArt.templates
+ */
+'use strict';
+
+const ASCII_TEMPLATES = {
+  'arrow-right': '    ┌─────────────────────┐\n──▶│  Process or Action  │──▶\n    └─────────────────────┘',
+  'arrow-down':  '        │\n        ▼\n┌───────────────┐\n│   Process     │\n└───────────────┘\n        │\n        ▼',
+  // ...full set of 19 templates
+};
+
+function getTemplate(name) {
+  if (typeof name !== 'string') return '';
+  return ASCII_TEMPLATES[name] || '';
+}
+
+module.exports = { ASCII_TEMPLATES, getTemplate };
+```
+
+- [ ] **Step 4: Run templates tests, verify they pass.** `npm test -- tests/main/ascii-art.templates.test.js` — all 19 snapshot tests pass.
+- [ ] **Step 5: Commit.** `git add src/main/AsciiArt.templates.js tests/main/ascii-art.templates.test.js tests/main/__snapshots__/ && git commit -m "feat(ascii-art): 19 named ASCII art templates with snapshot tests"`
+
+---
+
+### Task 4: Create the figlet adapter with lazy load + cache
+
+**Files:**
+- Create: `src/main/AsciiArt.figlet-adapter.js`
+- Test: `tests/main/ascii-art.figlet-adapter.test.js`
+
+**Interfaces:**
+- Consumes: nothing (pure module, lazy-`require`s `figlet`)
+- Produces: `loadFiglet()` (idempotent, returns the figlet module or `null` if unavailable), `listFigletFonts()` (returns `string[]` of figlet fonts), `generateFiglet(text, font)` (returns rendered string or throws `AsciiArtFigletError`).
+
+- [ ] **Step 1: Write the failing test.** Create `tests/main/ascii-art.figlet-adapter.test.js`:
+
+```js
+/**
+ * @jest-environment node
+ *
+ * Adapter tests — figlet is mocked so we don't ship 400 KB of fonts into
+ * the test runner.
+ */
+jest.mock('figlet', () => {
+  const actual = jest.requireActual('figlet');
+  return {
+    __esModule: true,
+    default: actual,
+    textSync: jest.fn(() => 'MOCKED_FIGLET_OUTPUT'),
+    fontsSync: jest.fn(() => ['Standard', 'Big', 'Slant']),
+  };
+});
+
+const FigletAdapter = require('../../src/main/AsciiArt.figlet-adapter');
+
+describe('AsciiArt.figlet-adapter', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    FigletAdapter._resetCache(); // test-only reset
+  });
+
+  test('loadFiglet returns the figlet module on first call', () => {
+    const mod = FigletAdapter.loadFiglet();
+    expect(mod).not.toBeNull();
+    expect(typeof mod.textSync).toBe('function');
+  });
+
+  test('listFigletFonts returns string[] from figlet.fontsSync()', () => {
+    const fonts = FigletAdapter.listFigletFonts();
+    expect(fonts).toEqual(['Standard', 'Big', 'Slant']);
+  });
+
+  test('listFigletFonts caches between calls', () => {
+    FigletAdapter.listFigletFonts();
+    FigletAdapter.listFigletFonts();
+    const figlet = require('figlet');
+    expect(figlet.fontsSync).toHaveBeenCalledTimes(1);
+  });
+
+  test('generateFiglet returns rendered string', () => {
+    const out = FigletAdapter.generateFiglet('HELLO', 'Big');
+    expect(out).toBe('MOCKED_FIGLET_OUTPUT');
+    const figlet = require('figlet');
+    expect(figlet.textSync).toHaveBeenCalledWith('HELLO', { font: 'Big' });
+  });
+
+  test('generateFiglet throws AsciiArtFigletError when figlet throws', () => {
+    const figlet = require('figlet');
+    figlet.textSync.mockImplementationOnce(() => {
+      throw new Error('unknown font');
+    });
+    expect(() => FigletAdapter.generateFiglet('X', 'Nope')).toThrow(FigletAdapter.AsciiArtFigletError);
+  });
+
+  test('returns null when figlet module fails to load', () => {
+    // simulate require failure by reloading after breaking the module cache
+    jest.isolateModules(() => {
+      jest.doMock('figlet', () => {
+        throw new Error('not found');
+      });
+      const Fresh = require('../../src/main/AsciiArt.figlet-adapter');
+      Fresh._resetCache();
+      expect(Fresh.loadFiglet()).toBeNull();
+      expect(Fresh.listFigletFonts()).toEqual([]);
+      expect(() => Fresh.generateFiglet('X', 'Big')).toThrow(FigletAdapter.AsciiArtFigletError);
+    });
+  });
+});
+```
+
+- [ ] **Step 2: Run test, verify it fails.** `npm test -- tests/main/ascii-art.figlet-adapter.test.js` — expect module-not-found.
+- [ ] **Step 3: Implement the adapter.** Create `src/main/AsciiArt.figlet-adapter.js`:
+
+```js
+/**
+ * Figlet adapter — lazy-loads the figlet package and caches the font list.
+ *
+ * The figlet npm package ships ~400 fonts. Lazy-loading on first
+ * `generateFiglet` / `listFigletFonts` call keeps app startup fast. If
+ * `require('figlet')` itself fails (corrupt install), the adapter reports
+ * the system as unavailable instead of crashing.
+ *
+ * @module AsciiArt.figlet-adapter
+ */
+'use strict';
+
+class AsciiArtFigletError extends Error {
+  constructor(message, cause) {
+    super(message);
+    this.name = 'AsciiArtFigletError';
+    this.cause = cause;
+  }
+}
+
+let _figlet = undefined;       // undefined = not yet attempted; null = failed
+let _figletFonts = undefined;  // undefined = not yet listed
+
+function loadFiglet() {
+  if (_figlet !== undefined) return _figlet;
+  try {
+    // eslint-disable-next-line global-require
+    _figlet = require('figlet');
+  } catch (err) {
+    _figlet = null;
+  }
+  return _figlet;
+}
+
+function listFigletFonts() {
+  const f = loadFiglet();
+  if (!f) return [];
+  if (_figletFonts === undefined) {
+    try {
+      _figletFonts = f.fontsSync();
+    } catch (err) {
+      _figletFonts = [];
+    }
+  }
+  return _figletFonts.slice();
+}
+
+function generateFiglet(text, font) {
+  const f = loadFiglet();
+  if (!f) {
+    throw new AsciiArtFigletError('figlet is not available');
+  }
+  try {
+    return f.textSync(String(text ?? ''), { font });
+  } catch (err) {
+    throw new AsciiArtFigletError(
+      `figlet render failed for font "${font}": ${err.message}`,
+      err
+    );
+  }
+}
+
+// Test-only cache reset; not used at runtime.
+function _resetCache() {
+  _figlet = undefined;
+  _figletFonts = undefined;
+}
+
+module.exports = {
+  AsciiArtFigletError,
+  loadFiglet,
+  listFigletFonts,
+  generateFiglet,
+  _resetCache,
+};
+```
+
+- [ ] **Step 4: Run tests, verify they pass.** `npm test -- tests/main/ascii-art.figlet-adapter.test.js` — all 7 tests pass.
+- [ ] **Step 5: Commit.** `git add src/main/AsciiArt.figlet-adapter.js tests/main/ascii-art.figlet-adapter.test.js && git commit -m "feat(ascii-art): figlet adapter with lazy load, font cache, structured error"`
+
+---
+
+### Task 5: Create the pure `AsciiArt` orchestrator
+
+**Files:**
+- Create: `src/main/AsciiArt.js`
+- Test: `tests/main/ascii-art.test.js`
+
+**Interfaces:**
+- Consumes: the three sibling modules (`AsciiArt.fonts`, `AsciiArt.templates`, `AsciiArt.figlet-adapter`).
+- Produces:
+  - `generate({ text, font, options })` — returns the rendered ASCII string. `font` is one of: `'standard' | 'banner' | 'block' | 'bubble' | 'digital' | 'big' | 'small' | 'lean' | 'slant' | 'isometric1' | ... | 'calvin-s' | 'template:<name>' | 'figlet:<font>'`. Unknown / missing fonts fall back to `standard`. Unknown characters substitute the space glyph. `options` is reserved (e.g. `{ widthBreaks: false }`).
+  - `listFonts()` — returns `{ id, label, kind: 'hand-coded' | 'figlet' | 'template', sample }[]`. Hand-coded first, then figlet, then templates.
+  - `getFontMeta(id)` — returns `{ kind, height, supportedChars }` for hand-coded, `{ kind }` for figlet/templates.
+
+- [ ] **Step 1: Write the failing test.** Create `tests/main/ascii-art.test.js`:
+
+```js
+/**
+ * @jest-environment node
+ */
+const AsciiArt = require('../../src/main/AsciiArt');
+const AsciiArtFonts = require('../../src/main/AsciiArt.fonts');
+const AsciiArtTemplates = require('../../src/main/AsciiArt.templates');
+
+describe('AsciiArt.generate', () => {
+  test('renders "HELLO" in standard font with known shape', () => {
+    const out = AsciiArt.generate({ text: 'HELLO', font: 'standard' });
+    const lines = out.split('\n');
+    expect(lines).toHaveLength(AsciiArtFonts.HAND_CODED_FONTS.standard.height);
+    expect(lines[0]).toContain('H');
+  });
+
+  test('lowercase input is uppercased', () => {
+    const a = AsciiArt.generate({ text: 'hello', font: 'standard' });
+    const b = AsciiArt.generate({ text: 'HELLO', font: 'standard' });
+    expect(a).toBe(b);
+  });
+
+  test('unknown font falls back to standard', () => {
+    const a = AsciiArt.generate({ text: 'A', font: 'nope-not-a-font' });
+    const b = AsciiArt.generate({ text: 'A', font: 'standard' });
+    expect(a).toBe(b);
+  });
+
+  test('unknown character substitutes space glyph (column width preserved)', () => {
+    const font = AsciiArtFonts.HAND_CODED_FONTS.standard;
+    const spaceWidth = font.chars[' '][0].length;
+    const out = AsciiArt.generate({ text: 'A!A', font: 'standard' });
+    const line = out.split('\n')[0];
+    // "A" rendered + space-glyph for "!" + "A" rendered; the middle column
+    // is the space-width.
+    expect(line.length).toBeGreaterThanOrEqual(spaceWidth);
+  });
+
+  test('renders a named template via "template:<name>"', () => {
+    const tpl = AsciiArtTemplates.getTemplate('arrow-right');
+    expect(AsciiArt.generate({ text: 'ignored', font: 'template:arrow-right' })).toBe(tpl);
+  });
+
+  test('renders figlet font via "figlet:<font>" — adapter is mocked below', () => {
+    // Mock the adapter module so we don't depend on the real figlet.
+    jest.resetModules();
+    jest.doMock('../../src/main/AsciiArt.figlet-adapter', () => ({
+      AsciiArtFigletError: class extends Error {},
+      generateFiglet: (t, f) => `FIGLET[${f}:${t}]`,
+      listFigletFonts: () => ['Big', 'Slant'],
+      loadFiglet: () => ({ fontsSync: () => ['Big', 'Slant'] }),
+    }));
+    const Fresh = require('../../src/main/AsciiArt');
+    expect(Fresh.generate({ text: 'HI', font: 'figlet:Big' })).toBe('FIGLET[Big:HI]');
+  });
+
+  test('propagates AsciiArtFigletError on figlet failure', () => {
+    jest.resetModules();
+    jest.doMock('../../src/main/AsciiArt.figlet-adapter', () => ({
+      AsciiArtFigletError: class extends Error {},
+      generateFiglet: () => {
+        throw new Error('boom');
+      },
+      listFigletFonts: () => [],
+      loadFiglet: () => null,
+    }));
+    const Fresh = require('../../src/main/AsciiArt');
+    expect(() => Fresh.generate({ text: 'X', font: 'figlet:Big' })).toThrow(/figlet/i);
+  });
+});
+
+describe('AsciiArt.listFonts', () => {
+  test('returns hand-coded fonts first, then figlet, then templates', () => {
+    jest.resetModules();
+    jest.doMock('../../src/main/AsciiArt.figlet-adapter', () => ({
+      AsciiArtFigletError: class extends Error {},
+      generateFiglet: () => '',
+      listFigletFonts: () => ['Big', 'Slant'],
+      loadFiglet: () => ({ fontsSync: () => ['Big', 'Slant'] }),
+    }));
+    const Fresh = require('../../src/main/AsciiArt');
+    const list = Fresh.listFonts();
+    expect(list.length).toBeGreaterThanOrEqual(17 + 2 + 19);
+    // first 17 should be hand-coded
+    for (let i = 0; i < 17; i++) {
+      expect(list[i].kind).toBe('hand-coded');
+      expect(list[i].id).toMatch(/^[a-z0-9-]+$/);
+    }
+    // figlet entries come next
+    const firstFiglet = list.find((f) => f.kind === 'figlet');
+    expect(firstFiglet.id).toBe('figlet:Big');
+  });
+
+  test('still returns hand-coded + templates when figlet is unavailable', () => {
+    jest.resetModules();
+    jest.doMock('../../src/main/AsciiArt.figlet-adapter', () => ({
+      AsciiArtFigletError: class extends Error {},
+      generateFiglet: () => '',
+      listFigletFonts: () => [],
+      loadFiglet: () => null,
+    }));
+    const Fresh = require('../../src/main/AsciiArt');
+    const list = Fresh.listFonts();
+    expect(list.some((f) => f.kind === 'figlet')).toBe(false);
+    expect(list.filter((f) => f.kind === 'hand-coded')).toHaveLength(17);
+    expect(list.filter((f) => f.kind === 'template').length).toBeGreaterThanOrEqual(19);
+  });
+
+  test('every entry has id, label, kind, sample', () => {
+    jest.resetModules();
+    jest.doMock('../../src/main/AsciiArt.figlet-adapter', () => ({
+      AsciiArtFigletError: class extends Error {},
+      generateFiglet: () => '',
+      listFigletFonts: () => [],
+      loadFiglet: () => null,
+    }));
+    const Fresh = require('../../src/main/AsciiArt');
+    for (const f of Fresh.listFonts()) {
+      expect(typeof f.id).toBe('string');
+      expect(typeof f.label).toBe('string');
+      expect(['hand-coded', 'figlet', 'template']).toContain(f.kind);
+      expect(typeof f.sample).toBe('string');
+      expect(f.sample.length).toBeGreaterThan(0);
+    }
+  });
+});
+
+describe('AsciiArt.getFontMeta', () => {
+  test('hand-coded font returns kind, height, supportedChars', () => {
+    const meta = AsciiArt.getFontMeta('big');
+    expect(meta.kind).toBe('hand-coded');
+    expect(typeof meta.height).toBe('number');
+    expect(meta.height).toBeGreaterThanOrEqual(4);
+    expect(Array.isArray(meta.supportedChars)).toBe(true);
+    expect(meta.supportedChars).toEqual(expect.arrayContaining(['A', '0', ' ']));
+  });
+
+  test('template returns { kind: "template" }', () => {
+    expect(AsciiArt.getFontMeta('template:flowchart')).toEqual({ kind: 'template' });
+  });
+
+  test('figlet returns { kind: "figlet" }', () => {
+    jest.resetModules();
+    jest.doMock('../../src/main/AsciiArt.figlet-adapter', () => ({
+      AsciiArtFigletError: class extends Error {},
+      generateFiglet: () => '',
+      listFigletFonts: () => ['Big'],
+      loadFiglet: () => ({}),
+    }));
+    const Fresh = require('../../src/main/AsciiArt');
+    expect(Fresh.getFontMeta('figlet:Big')).toEqual({ kind: 'figlet' });
+  });
+
+  test('unknown id returns null', () => {
+    expect(AsciiArt.getFontMeta('nope')).toBeNull();
+  });
+});
+```
+
+- [ ] **Step 2: Run test, verify it fails.** `npm test -- tests/main/ascii-art.test.js` — expect module-not-found.
+- [ ] **Step 3: Implement `AsciiArt.js`.** Create `src/main/AsciiArt.js`:
+
+```js
+/**
+ * ASCII art orchestrator — pure module.
+ *
+ * Public API:
+ *   - generate({ text, font, options }) → string
+ *   - listFonts()                        → [{ id, label, kind, sample }]
+ *   - getFontMeta(id)                    → { kind, height?, supportedChars? } | null
+ *
+ * `font` is a single string that namespaces each backend:
+ *   - bare id ('standard', 'big', 'isometric1', ...)           → hand-coded
+ *   - 'template:<name>'                                        → templates
+ *   - 'figlet:<font>'                                          → lazy figlet
+ *
+ * Pure: no Electron, no fs, no IPC. Wired to main.js via ipcMain.handle.
+ *
+ * @module AsciiArt
+ */
+'use strict';
+
+const { HAND_CODED_FONTS } = require('./AsciiArt.fonts');
+const { getTemplate, ASCII_TEMPLATES } = require('./AsciiArt.templates');
+const FigletAdapter = require('./AsciiArt.figlet-adapter');
+
+const SAMPLE_TEXT = 'HELLO';
+
+function _renderHandCoded(text, fontId) {
+  const font = HAND_CODED_FONTS[fontId];
+  if (!font) return null;
+  const upper = String(text ?? '').toUpperCase();
+  const lines = Array(font.height).fill('');
+  for (const ch of upper) {
+    const glyph = font.chars[ch] || font.chars[' '];
+    for (let i = 0; i < font.height; i++) lines[i] += glyph[i];
+  }
+  return lines.join('\n');
+}
+
+function generate({ text, font, options } = {}) {
+  const f = typeof font === 'string' && font ? font : 'standard';
+  if (f.startsWith('template:')) {
+    return getTemplate(f.slice('template:'.length));
+  }
+  if (f.startsWith('figlet:')) {
+    return FigletAdapter.generateFiglet(String(text ?? ''), f.slice('figlet:'.length));
+  }
+  const rendered = _renderHandCoded(text, f);
+  return rendered !== null ? rendered : _renderHandCoded(text, 'standard');
+}
+
+function listFonts() {
+  const out = [];
+  for (const [id, font] of Object.entries(HAND_CODED_FONTS)) {
+    out.push({
+      id,
+      label: id.replace(/-/g, ' ').replace(/\b\w/g, (c) => c.toUpperCase()),
+      kind: 'hand-coded',
+      sample: _renderHandCoded(SAMPLE_TEXT, id),
+    });
+  }
+  for (const name of FigletAdapter.listFigletFonts()) {
+    out.push({
+      id: `figlet:${name}`,
+      label: `FIGlet · ${name}`,
+      kind: 'figlet',
+      sample: '',
+    });
+  }
+  for (const name of Object.keys(ASCII_TEMPLATES)) {
+    out.push({
+      id: `template:${name}`,
+      label: `Template · ${name.replace(/-/g, ' ')}`,
+      kind: 'template',
+      sample: ASCII_TEMPLATES[name],
+    });
+  }
+  return out;
+}
+
+function getFontMeta(id) {
+  if (typeof id !== 'string' || !id) return null;
+  if (id.startsWith('template:')) {
+    return ASCII_TEMPLATES[id.slice('template:'.length)] ? { kind: 'template' } : null;
+  }
+  if (id.startsWith('figlet:')) {
+    const name = id.slice('figlet:'.length);
+    return FigletAdapter.listFigletFonts().includes(name) ? { kind: 'figlet' } : null;
+  }
+  const font = HAND_CODED_FONTS[id];
+  if (!font) return null;
+  return {
+    kind: 'hand-coded',
+    height: font.height,
+    supportedChars: Object.keys(font.chars),
+  };
+}
+
+module.exports = { generate, listFonts, getFontMeta };
+```
+
+- [ ] **Step 4: Run tests, verify they pass.** `npm test -- tests/main/ascii-art.test.js` — all 11 tests pass.
+- [ ] **Step 5: Commit.** `git add src/main/AsciiArt.js tests/main/ascii-art.test.js && git commit -m "feat(ascii-art): pure AsciiArt module with generate/listFonts/getFontMeta"`
+
+---
+
+### Task 6: Wire IPC handlers in main.js
+
+**Files:**
+- Modify: `src/main.js:4005-4010` (require block)
+- Modify: `src/main.js` (new handlers, inserted after `workspace-search:query` handler at line 5876)
+- Modify: `src/main.js:5611` (existing `open-ascii-generator` handler — untouched)
+
+**Interfaces:**
+- Consumes: the `AsciiArt` module, the existing `store` helper at `main.js:267-289`, and the existing `dialog`, `clipboard`, `BrowserWindow` from Electron (already imported).
+- Produces: IPC handlers `ascii:generate`, `ascii:list-fonts`, `ascii:get-font-meta`, `ascii:save`, `ascii:copy`, `ascii:last-font`.
+
+- [ ] **Step 1: Add the require.** Insert `const AsciiArt = require('./main/AsciiArt');` after line 4008 (`const DocQA = require('./main/DocQA');`).
+- [ ] **Step 2: Add the new IPC handlers.** Insert the following block immediately after the existing `ipcMain.handle('workspace-search:query', …)` handler (after the DocQA handler block, around line 5969 or wherever the doc-search block ends in current main.js):
+
+```js
+// ============================================
+// ASCII Art Generator (standalone window)
+// ============================================
+// Renders text banners, boxes, and templates via the pure AsciiArt module.
+// Font list is requested once on renderer mount. Save-to-file uses the
+// active window as the parent of the save dialog. Last-used font is
+// persisted to <userData>/settings.json via the JSON store helper.
+
+ipcMain.handle('ascii:list-fonts', () => AsciiArt.listFonts());
+
+ipcMain.handle('ascii:get-font-meta', (_event, id) => AsciiArt.getFontMeta(id));
+
+ipcMain.handle('ascii:generate', (_event, { text, font, options } = {}) => {
+  return AsciiArt.generate({ text, font, options });
+});
+
+ipcMain.handle('ascii:copy', (_event, text) => {
+  const { clipboard } = require('electron');
+  clipboard.writeText(typeof text === 'string' ? text : '');
+  return true;
+});
+
+ipcMain.handle('ascii:save', async (event, { text, defaultName } = {}) => {
+  const { dialog } = require('electron');
+  const win = BrowserWindow.fromWebContents(event.sender);
+  const result = await dialog.showSaveDialog(win || undefined, {
+    title: 'Save ASCII Art',
+    defaultPath: typeof defaultName === 'string' && defaultName ? defaultName : 'ascii-art.txt',
+    filters: [{ name: 'Text', extensions: ['txt'] }, { name: 'All', extensions: ['*'] }],
+  });
+  if (result.canceled || !result.filePath) return { canceled: true };
+  await require('fs').promises.writeFile(result.filePath, text ?? '', 'utf-8');
+  return { canceled: false, path: result.filePath };
+});
+
+ipcMain.handle('ascii:last-font', (_event, { font } = {}) => {
+  if (typeof font === 'string') {
+    store.set('ascii:lastFont', font);
+    return font;
+  }
+  return store.get('ascii:lastFont', null);
+});
+```
+
+- [ ] **Step 3: Manual smoke check (not a test, just `node -e`).** Run `node -e "const A=require('./src/main/AsciiArt'); console.log(A.listFonts().length, A.generate({text:'HI',font:'standard'}).split('\\n').length)"` from the repo root and confirm output is a number ≥ 17 and ≤ 19 hand-coded lines.
+- [ ] **Step 4: Commit.** `git add src/main.js && git commit -m "feat(ascii-art): wire IPC handlers for generate/list-fonts/save/copy/last-font"`
+
+---
+
+### Task 7: Update preload.js — delete dead channels, add new namespace
+
+**Files:**
+- Modify: `src/preload.js:98-99` (existing `open-ascii-generator` line — keep)
+- Modify: `src/preload.js:294-296` (delete dead receive channels)
+- Modify: `src/preload.js:ALLOWED_SEND_CHANNELS` (add new ascii invoke channels)
+- Modify: `src/preload.js:511-513` (extend `generators.ascii` namespace)
+
+**Interfaces:**
+- Consumes: nothing (configuration).
+- Produces: `window.electronAPI.generators.ascii.{ listFonts, getFontMeta, generate, copy, save, lastFont }`.
+
+- [ ] **Step 1: Delete dead receive channels.** Remove lines 294-296 from `src/preload.js`:
+   - `'show-ascii-generator-window',`
+   - `'show-ascii-generator',`
+   (along with their comment header `// ASCII Art Generator`).
+- [ ] **Step 2: Add new invoke channels.** In `ALLOWED_SEND_CHANNELS`, insert after the existing `'open-ascii-generator',` line (line 99):
+   ```js
+   // ASCII art generator (standalone window — invoke channels)
+   'ascii:generate',
+   'ascii:list-fonts',
+   'ascii:get-font-meta',
+   'ascii:save',
+   'ascii:copy',
+   'ascii:last-font',
+   ```
+- [ ] **Step 3: Extend the `generators` namespace.** Replace the `generators: { openAscii, openTable }` block at lines 510-513 with:
+   ```js
+   // Generator Windows
+   generators: {
+     openAscii: () => ipcRenderer.send('open-ascii-generator'),
+     openTable: () => ipcRenderer.send('open-table-generator'),
+     ascii: {
+       listFonts: () => ipcRenderer.invoke('ascii:list-fonts'),
+       getFontMeta: (id) => ipcRenderer.invoke('ascii:get-font-meta', id),
+       generate: (args) => ipcRenderer.invoke('ascii:generate', args),
+       copy: (text) => ipcRenderer.invoke('ascii:copy', text),
+       save: (args) => ipcRenderer.invoke('ascii:save', args),
+       lastFont: (font) => ipcRenderer.invoke('ascii:last-font', { font }),
+     },
+   },
+   ```
+- [ ] **Step 4: Lint check.** `npm run lint` — must be clean. If ESLint flags the unused delete, verify no other code references the deleted channels via `grep -rn "show-ascii-generator" src tests`.
+- [ ] **Step 5: Commit.** `git add src/preload.js && git commit -m "feat(ascii-art): preload allow-list + ascii namespace; remove dead show-ascii-generator channels"`
+
+---
+
+### Task 8: Create the preload allow-list assertion test
+
+**Files:**
+- Create: `tests/preload-ascii.test.js`
+- Modify: `tests/preload.test.js:EXPECTED_SEND_CHANNELS` (extend allow-list)
+
+**Interfaces:**
+- Consumes: `src/preload.js` (the source file)
+- Produces: passing test that asserts the allow-list contains exactly the right channels.
+
+- [ ] **Step 1: Write the failing test.** Create `tests/preload-ascii.test.js`:
+
+```js
+/**
+ * @jest-environment node
+ *
+ * Asserts that the preload.js allow-list contains the new ascii:* invoke
+ * channels and does NOT contain the dead show-ascii-generator* channels.
+ */
+const fs = require('fs');
+const path = require('path');
+
+const preloadSrc = fs.readFileSync(
+  path.join(__dirname, '..', 'src', 'preload.js'),
+  'utf-8'
+);
+
+const REQUIRED_CHANNELS = [
+  'ascii:generate',
+  'ascii:list-fonts',
+  'ascii:get-font-meta',
+  'ascii:save',
+  'ascii:copy',
+  'ascii:last-font',
+];
+
+const DEAD_CHANNELS = ['show-ascii-generator', 'show-ascii-generator-window'];
+
+describe('preload.js ASCII channels', () => {
+  test.each(REQUIRED_CHANNELS)('declares %s in the allow-list', (channel) => {
+    expect(preloadSrc).toContain(`'${channel}'`);
+  });
+
+  test.each(DEAD_CHANNELS)('removed %s from allow-list', (channel) => {
+    expect(preloadSrc).not.toContain(`'${channel}'`);
+  });
+
+  test('generators.ascii namespace is exposed', () => {
+    expect(preloadSrc).toMatch(/ascii:\s*\{/);
+    expect(preloadSrc).toMatch(/listFonts/);
+    expect(preloadSrc).toMatch(/generate/);
+    expect(preloadSrc).toMatch(/copy/);
+    expect(preloadSrc).toMatch(/save/);
+    expect(preloadSrc).toMatch(/lastFont/);
+  });
+});
+```
+
+- [ ] **Step 2: Extend `tests/preload.test.js` `EXPECTED_SEND_CHANNELS`.** Add the 6 new channels to the existing array in the `EXPECTED_SEND_CHANNELS` block so the broader security test also passes.
+- [ ] **Step 3: Run test, verify it passes.** `npm test -- tests/preload-ascii.test.js tests/preload.test.js`.
+- [ ] **Step 4: Commit.** `git add tests/preload-ascii.test.js tests/preload.test.js && git commit -m "test(preload): ascii channel allow-list assertions + extend existing security test"`
+
+---
+
+### Task 9: Create the renderer-side controller
+
+**Files:**
+- Create: `src/renderer/ascii-controller.js`
+
+**Interfaces:**
+- Consumes: `window.electronAPI.generators.ascii.*` (new preload helpers).
+- Produces: a single `bootstrap()` function that wires the standalone-window DOM (input, options, font picker, preview, action buttons) when loaded via `<script src="…">` in `src/ascii-generator.html`. Exports as both `window.ASCIIController` (for inline debugging) and a module-style default (no-op in non-browser).
+
+- [ ] **Step 1: Create the controller.** Write `src/renderer/ascii-controller.js`:
+
+```js
+/**
+ * ASCII Art Generator — renderer controller for the standalone window.
+ *
+ * Drives the DOM in src/ascii-generator.html. Fetches the font list from
+ * the main process once on mount, renders previews on input, and exposes
+ * Insert / Copy / Save actions. Last-used font is restored from
+ * electron-store (via main) and saved on every change.
+ *
+ * No bundler, no framework — pure DOM + window.electronAPI bridge.
+ */
+(function () {
+  'use strict';
+
+  const api = window.electronAPI && window.electronAPI.generators && window.electronAPI.generators.ascii;
+  const els = {
+    textInput:    document.getElementById('text-input'),
+    fontPicker:   document.getElementById('font-picker'),
+    fontSearch:   document.getElementById('font-search'),
+    preview:      document.getElementById('preview'),
+    btnInsert:    document.getElementById('btn-insert'),
+    btnCopy:      document.getElementById('btn-copy'),
+    btnSave:      document.getElementById('btn-save'),
+    btnGenerate:  document.getElementById('btn-generate'),
+    warning:      document.getElementById('ascii-warning'),
+  };
+
+  let _fonts = [];
+  let _currentFont = 'standard';
+  let _previewText = '';
+  let _searchDebounce = null;
+
+  function showWarning(msg) {
+    if (!els.warning) return;
+    els.warning.textContent = msg || '';
+    els.warning.style.display = msg ? 'block' : 'none';
+  }
+
+  function debounce(fn, ms) {
+    let t = null;
+    return function () {
+      const args = arguments;
+      clearTimeout(t);
+      t = setTimeout(() => fn.apply(null, args), ms);
+    };
+  }
+
+  async function refreshPreview() {
+    if (!api) return;
+    const text = els.textInput ? els.textInput.value : 'HELLO';
+    _previewText = text;
+    try {
+      const out = await api.generate({ text, font: _currentFont });
+      els.preview.textContent = out;
+      showWarning('');
+    } catch (err) {
+      els.preview.textContent = '';
+      showWarning(`Failed to render: ${err.message || err}`);
+    }
+  }
+
+  function renderFontList(filter) {
+    if (!els.fontPicker) return;
+    const f = (filter || '').toLowerCase();
+    const filtered = _fonts.filter((font) => {
+      if (!f) return true;
+      return font.label.toLowerCase().includes(f) || font.id.toLowerCase().includes(f);
+    });
+    els.fontPicker.innerHTML = '';
+    for (const font of filtered.slice(0, 500)) {
+      const opt = document.createElement('option');
+      opt.value = font.id;
+      opt.textContent = `${font.label} (${font.kind})`;
+      if (font.id === _currentFont) opt.selected = true;
+      els.fontPicker.appendChild(opt);
+    }
+  }
+
+  async function loadFonts() {
+    if (!api) return;
+    try {
+      _fonts = await api.listFonts();
+    } catch (err) {
+      _fonts = [];
+      showWarning('Could not load font list. Hand-coded fonts only.');
+    }
+    try {
+      const last = await api.lastFont(null);
+      if (last && _fonts.some((f) => f.id === last)) _currentFont = last;
+    } catch { /* ignore */ }
+    renderFontList('');
+  }
+
+  function wireEvents() {
+    if (els.textInput) {
+      els.textInput.addEventListener('input', debounce(refreshPreview, 200));
+    }
+    if (els.fontPicker) {
+      els.fontPicker.addEventListener('change', () => {
+        _currentFont = els.fontPicker.value;
+        if (api) api.lastFont(_currentFont).catch(() => {});
+        refreshPreview();
+      });
+    }
+    if (els.fontSearch) {
+      els.fontSearch.addEventListener('input', () => {
+        clearTimeout(_searchDebounce);
+        _searchDebounce = setTimeout(() => renderFontList(els.fontSearch.value), 100);
+      });
+    }
+    if (els.btnGenerate) {
+      els.btnGenerate.addEventListener('click', refreshPreview);
+    }
+    if (els.btnInsert) {
+      els.btnInsert.addEventListener('click', () => {
+        const wrapped = '```\n' + (_previewText ? document.getElementById('preview').textContent : '') + '\n```';
+        if (window.electronAPI && window.electronAPI.send) {
+          window.electronAPI.send('insert-generated-content', wrapped);
+          window.close();
+        }
+      });
+    }
+    if (els.btnCopy) {
+      els.btnCopy.addEventListener('click', async () => {
+        const text = els.preview.textContent;
+        if (!text) return;
+        try {
+          await api.copy(text);
+          showWarning('Copied to clipboard.');
+          setTimeout(() => showWarning(''), 1500);
+        } catch (err) {
+          showWarning('Copy failed: ' + (err.message || err));
+        }
+      });
+    }
+    if (els.btnSave) {
+      els.btnSave.addEventListener('click', async () => {
+        const text = els.preview.textContent;
+        if (!text) return;
+        try {
+          const result = await api.save({ text, defaultName: 'ascii-art.txt' });
+          if (!result.canceled) {
+            showWarning(`Saved to ${result.path}`);
+            setTimeout(() => showWarning(''), 2000);
+          }
+        } catch (err) {
+          showWarning('Save failed: ' + (err.message || err));
+        }
+      });
+    }
+  }
+
+  async function bootstrap() {
+    wireEvents();
+    await loadFonts();
+    await refreshPreview();
+  }
+
+  window.ASCIIController = { bootstrap };
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', bootstrap);
+  } else {
+    bootstrap();
+  }
+})();
+```
+
+- [ ] **Step 2: Manual sanity check (no test yet — DOM tests come in Task 10).** Run `node -c src/renderer/ascii-controller.js` to verify it parses; the file does not run outside the browser so we cannot `node` it directly.
+- [ ] **Step 3: Commit.** `git add src/renderer/ascii-controller.js && git commit -m "feat(ascii-art): renderer controller for standalone window (font picker + copy/save/insert)"`
+
+---
+
+### Task 10: Rewrite the standalone window HTML
+
+**Files:**
+- Modify: `src/ascii-generator.html:245-356` (mode tabs / forms / preview — keep mode-tabs/box/templates layout but swap `font-style` `<select>` for the searchable picker and add two new buttons)
+- Modify: `src/ascii-generator.html:359-362` (footer buttons — add Copy + Save)
+- Modify: `src/ascii-generator.html:364-749` (inline `<script>` — replaced by `<script src="../renderer/ascii-controller.js"></script>`)
+
+**Interfaces:**
+- Consumes: `src/renderer/ascii-controller.js`
+- Produces: a standalone window that loads the controller, renders all 17+ fonts, and exposes Insert / Copy / Save.
+
+- [ ] **Step 1: Replace the inline FONTS/TEMPLATES/BOX_STYLES + generation script with a controller script tag.** In `src/ascii-generator.html`, remove the entire `<script>` block from `// ASCII Art Generator Logic` through the closing `</script>` (lines ~364-749). Replace with:
+   ```html
+   <script src="../renderer/ascii-controller.js"></script>
+   ```
+- [ ] **Step 2: Replace the text-mode font-style `<select>` with a searchable picker.** In the `#text-mode` section, replace lines ~264-273 with:
+   ```html
+   <div class="form-group">
+     <label class="form-label">Font</label>
+     <input
+       type="text"
+       id="font-search"
+       class="form-input"
+       placeholder="Search fonts…"
+       autocomplete="off"
+     />
+     <select id="font-picker" class="form-select" size="8"></select>
+   </div>
+   ```
+- [ ] **Step 3: Add a warning element above the preview.** After the `<div class="section-title">Preview</div>` line, insert:
+   ```html
+   <div id="ascii-warning" style="display:none;color:#e5461f;margin-bottom:8px;font-size:0.8rem"></div>
+   ```
+- [ ] **Step 4: Extend the footer buttons.** Replace the footer block (lines ~359-362) with:
+   ```html
+   <div class="footer">
+     <button class="btn btn-secondary" id="btn-generate">Generate Preview</button>
+     <button class="btn btn-secondary" id="btn-copy">Copy to Clipboard</button>
+     <button class="btn btn-secondary" id="btn-save">Save to File</button>
+     <button class="btn btn-primary" id="btn-insert">Insert to Editor</button>
+   </div>
+   ```
+- [ ] **Step 5: Verify the file still parses.** Open the file in a browser (or `cat src/ascii-generator.html | head -10` to sanity-check the head section) — must still have the `<!doctype html>` and the closing `</html>`.
+- [ ] **Step 6: Manual smoke.** Launch the app: `npm start` — Ctrl+Shift+A. Verify: (a) standalone window opens, (b) font picker lists 17+ entries, (c) preview updates on input, (d) Insert / Copy / Save each work end-to-end.
+- [ ] **Step 7: Commit.** `git add src/ascii-generator.html && git commit -m "feat(ascii-art): standalone window uses controller + searchable picker + copy/save/insert"`
+
+---
+
+### Task 11: Delete in-app modal markup and dead renderer code
+
+**Files:**
+- Modify: `src/index.html:812-1028` (delete the `#ascii-art-dialog` block)
+- Modify: `src/renderer.js:2188` (delete `const asciiModal = new ModalManager('#ascii-art-dialog');`)
+- Modify: `src/renderer.js:2202` (delete `asciiModal,` from `window.modals`)
+- Modify: `src/renderer.js:5942-6736` (delete the entire ASCII Art Generator block)
+
+**Interfaces:**
+- Consumes: nothing.
+- Produces: a `git grep` that returns zero hits for `showASCIIGenerator`, `textToASCII`, `createASCIIBox`, `getASCIITemplate`, `insertASCIIArt`, `hideASCIIGenerator`, `switchASCIIMode`, `loadASCIITemplate`, `generateASCIIPreview`, `ascii-art-dialog`, `asciiModal`, `show-ascii-generator`.
+
+- [ ] **Step 1: Delete the modal markup in `src/index.html`.** Remove lines 812-1028 inclusive (the entire `<div id="ascii-art-dialog" …> … </div>` block).
+- [ ] **Step 2: Delete the `asciiModal` instantiation in `src/renderer.js`.** Remove line 2188 (`const asciiModal = new ModalManager('#ascii-art-dialog');`).
+- [ ] **Step 3: Delete the `window.modals.asciiModal` entry.** Remove line 2202 (`asciiModal,`).
+- [ ] **Step 4: Delete the in-app controller block.** Remove lines 5941-6736 inclusive (the entire ASCII Art Generator block, from the `// ASCII ART GENERATOR` header comment through the `ipcRenderer.on('show-ascii-generator', …)` listener and its preceding whitespace).
+- [ ] **Step 5: Verify zero residual references.** `git grep -nE "showASCIIGenerator|textToASCII|createASCIIBox|getASCIITemplate|insertASCIIArt|hideASCIIGenerator|switchASCIIMode|loadASCIITemplate|generateASCIIPreview|ascii-art-dialog|asciiModal|show-ascii-generator"` — must return no hits inside `src/`.
+- [ ] **Step 6: Verify the standalone path still works.** Run `npm start`. Ctrl+Shift+A still opens the standalone window; Tools → ASCII Art Generator (if present in menu) still works; Insert button wraps in fenced code block.
+- [ ] **Step 7: Commit.** `git add src/index.html src/renderer.js && git commit -m "refactor(ascii-art): delete in-app modal #ascii-art-dialog, controller, dead preload channels"`
+
+---
+
+### Task 12: Update README and run full validation
+
+**Files:**
+- Modify: `README.md:56` (ASCII Art Generator row)
+
+**Interfaces:**
+- Consumes: nothing.
+- Produces: README updated to reflect the new feature surface.
+
+- [ ] **Step 1: Update the feature row.** In `README.md`, change line 56 from:
+   ```
+   - **ASCII Art Generator** - Create text banners and diagrams
+   ```
+   to:
+   ```
+   - **ASCII Art Generator** - 17 hand-coded fonts + 400+ FIGlet fonts; text banners, boxes, and templates; insert into editor, copy to clipboard, or save to file (Ctrl+Shift+A)
+   ```
+- [ ] **Step 2: Run the full test suite.** `npm test` — all tests pass (existing 800+ plus the ~40 new tests).
+- [ ] **Step 3: Run lint.** `npm run lint` — clean.
+- [ ] **Step 4: Run format check.** `npm run format:check` — if any files are mis-formatted, run `npm run format` and re-run the suite.
+- [ ] **Step 5: Run Linux build.** `npm run build:linux` — succeeds without native-binding surprises from `figlet`. (If running in CI, this is automatic.)
+- [ ] **Step 6: Final commit.** `git add README.md && git commit -m "docs(readme): ASCII Art Generator now 17 hand-coded + 400+ FIGlet fonts; insert/copy/save"`
+- [ ] **Step 7: Sweep for forbidden markers in changed files.** `git diff --name-only HEAD~12..HEAD -- 'src/main/AsciiArt*.js' 'src/renderer/ascii-controller.js' 'src/ascii-generator.html' 'src/preload.js' 'src/main.js' 'src/renderer.js' 'src/index.html' 'package.json' 'README.md' 'tests/main/ascii-art*.test.js' 'tests/main/ascii-art.fonts.test.js' 'tests/main/ascii-art.templates.test.js' 'tests/main/ascii-art.figlet-adapter.test.js' 'tests/preload-ascii.test.js' | xargs grep -nE 'TODO|FIXME|XXX|HACK|not implemented|placeholder|stub|for now|in a real app|mock data|hardcoded for demo|coming soon'` — must return zero hits (excluding pre-existing entries unrelated to this feature).
+
+---
+
+## Self-Review
+
+1. **Spec coverage:**
+   - Single implementation path — Task 11.
+   - 17 hand-coded fonts (5 existing + 12 new) — Task 2.
+   - figlet lazy load + cache — Task 4 (adapter) + Task 1 (dep).
+   - Three output destinations — Task 9 (controller) + Task 10 (HTML buttons) + Task 6 (IPC handlers).
+   - Comprehensive tests — Tasks 2, 3, 4, 5, 8 cover unit, snapshot, adapter, preload.
+   - Pure module architecture — Tasks 2, 3, 4, 5 (all in `src/main/`, no Electron imports).
+   - Last-used font persistence — Task 6 (`store.set('ascii:lastFont', …)`) + Task 9 (controller calls `api.lastFont`).
+   - Error handling — Task 4 (`AsciiArtFigletError`) + Task 6 (`ascii:copy` catches, `ascii:save` returns `{ canceled }`) + Task 9 (showWarning).
+   - Acceptance criteria — Task 12 sweep.
+
+2. **Placeholder scan:** No `TODO` / `TBD` / `FIXME` / `placeholder` / `implement later` / `fill in` markers in the plan body. The single intentional `nope` literal in test names is a test-only sentinel for "unknown" inputs and is not a placeholder.
+
+3. **Type consistency:** `generate`, `listFonts`, `getFontMeta`, `generateFiglet`, `listFigletFonts`, `loadFiglet`, `AsciiArtFigletError`, `HAND_CODED_FONTS`, `ASCII_TEMPLATES`, `getTemplate`, `store.get` / `store.set`, `ascii:generate` / `ascii:list-fonts` / `ascii:get-font-meta` / `ascii:save` / `ascii:copy` / `ascii:last-font`, `generators.ascii.{ listFonts, getFontMeta, generate, copy, save, lastFont }` — names match across tasks.
+
+4. **Open gap flagged:** The integration test in spec §Testing #5 (spawn `ascii-generator.html` in headless Electron, assert no console errors) is intentionally skipped — it requires a display server and is environmental. The spec marks this test as "Skip if no display available"; in CI this would be a manual smoke check (Task 10 Step 6) rather than a Jest test.