docs: comprehensive project documentation for handoff

[jon-myers]

Summary

• Adds 13-chapter project documentation in docs/project/ (3,461 lines of markdown)
• Covers the full IDTAP project holistically: web app, Python API, deployment, research context
• Includes an HTML viewer (docs/project/viewer.html) for browsing locally via python3 -m http.server
• Updates .gitignore to track docs/project/ while keeping auto-generated TypeDoc ignored

Documentation Structure

1. Project Overview -- Mission, funding, publications, impact metrics
2. Development History -- 12 phases over 4 years, 4,010 commits
3. System Architecture -- Full-stack overview with data flow diagrams
4. Domain Model -- Piece→Phrase→Trajectory→Pitch, Raga, Meter/Tala, Assemblage
5. Spectrogram System -- End-to-end CQ pipeline, Web Worker rendering, cascade invalidation
6. Audio Synthesis -- 6 AudioWorklet engines, polyphonic routing architecture
7. Editor & Rendering -- D3 SVG, drag dots, chunked lazy loading, full 61-component UI inventory
8. Analysis & Query -- Pattern matching, pitch prevalence, DN_Extractor, assemblage analysis
9. Database & Storage -- MongoDB schema for all 15 collections, permission evolution, backup system
10. Python API -- PyPI package architecture, OAuth, data model parity
11. Deployment -- CI/CD, server management, backup procedures
12. Known Issues & Roadmap -- ~105 open issues categorized, architecture recommendations (including backend consolidation)
13. Onboarding Guide -- Setup, key files, common tasks, gotchas

Test plan

• All markdown files render correctly in the HTML viewer
• .gitignore correctly tracks docs/project/ while ignoring TypeDoc output

🤖 Generated with Claude Code