feat: add Writers Room Guide page (length targets + craft rules)

[atomantic]

Summary

Adds a Writers Room Guide — a deep-linkable documentation page at /writers-room/guide covering writing length targets, craft principles, and the analyses the editor will apply to your prose.

Reachable via a new Guide link in the Writers Room header (both the full and slim/editing header bars) and from ⌘K / voice navigation.

What's on the page

• Length Targets by Form — the literary length ladder with word and character bands:
  • Microfiction (≤500 words / ≤2,500–3,000 chars)
  • Flash Fiction (750–1,000 / 3,750–6,000)
  • Standard Short Story (1,500–7,500 / 7,500–45,000)
  • Novelette / Long Short Story (7,500–17,500 / 37,500–105,000)
  • Plus Novella & Novel rows for context (marked "context")
• Book-Length Estimates — page-based table (200 pages → 50–60k words; 300 pages → 75–90k words) with the ~250–300 words/page assumption documented.
• Craft Principles — grouped advice (Structure & Pacing, Character & Voice, Prose & Clarity, Revision Discipline).
• Editor Analyses — the planned Emotional Roadmap evaluator (charts the reader's beat-by-beat emotional journey) and a Length & Form Fit check, both flagged planned.

Design

• Length targets, book estimates, and principles live in one canonical data module — client/src/lib/writingGuide.js — so the forthcoming editor analyses read the same source the docs render from (no drift between docs and enforcement). Includes a classifyByWordCount() helper (gap-aware: a count between bands rounds up to the next form).
• Page is mobile-responsive (card grids collapse to single column; book table scrolls horizontally) and owns its own vertical scroll, since /writers-room/* is a full-width route.

Wiring

• New <Route path="writers-room/guide"> in App.jsx (lazy-loaded).
• New nav.writers-room.guide entry in server/lib/navManifest.js → ⌘K + voice ui_navigate.
• Module registered in the client/src/lib barrel + catalog README (enforced by index.test.js).

Tests

• client/src/lib/writingGuide.test.js — data-shape invariants (ids, ascending ladder, core categories) + classifyByWordCount band/gap/invalid-input behavior (9 tests).
• Existing navManifest.test.js + palette.test.js cover the new nav entry (30 passing).
• Client build ✓; client lib tests 13/13 ✓; server nav/palette tests 30/30 ✓.

[Copilot]

Pull request overview

Adds a new deep-linkable Writers Room Guide page at /writers-room/guide, wired into the Writers Room UI header and the global navigation manifest so it’s reachable via Cmd+K / voice navigation.

Changes:

• Added a new /writers-room/guide page rendering length targets, book-length estimates, craft principles, and planned editor analyses from a shared canonical data module.
• Introduced client/src/lib/writingGuide.js (+ tests) as the single source of truth for length bands/principles and a classifyByWordCount() helper.
• Wired navigation: new App route, new Writers Room header “Guide” links, and a new nav.writers-room.guide command entry (plus changelog/README/barrel export updates).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
server/lib/navManifest.js	Adds a new command palette / voice nav entry for /writers-room/guide.
client/src/pages/WritersRoomGuide.jsx	New Guide page UI rendering from the canonical writing guide data.
client/src/pages/WritersRoom.jsx	Adds “Guide” links to both Writers Room header variants.
client/src/lib/writingGuide.js	New canonical data module for length targets, craft principles, planned analyses, and classifyByWordCount().
client/src/lib/writingGuide.test.js	Adds vitest coverage for data shape invariants and word-count classification behavior.
client/src/lib/README.md	Documents the new writingGuide.js module in the lib catalog.
client/src/lib/index.js	Re-exports writingGuide.js from the lib barrel.
client/src/App.jsx	Adds lazy-loaded route for writers-room/guide.
.changelog/NEXT.md	Notes the new Writers Room Guide feature in vNEXT.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.