docs: mark all milestones complete (M8-M20) and pass FINAL gate

All 116 tasks implemented across M8-M20. Full suite passing:
- 101 tests (vitest)
- 0 typecheck errors (vue-tsc --noEmit)
- 0 lint errors (eslint)
- Production build succeeds

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

PROGRESS.md

@@ -1,8 +1,8 @@
 # AIUI Progress
 
 ## Current Status
-**Active Milestone**: M8 — Chat UX Polish (PLAN2.md)
-**Overall**: M0–M7 complete. 116 tasks planned across M8–M20 in PLAN2.md
+**Active Milestone**: COMPLETE
+**Overall**: M0–M20 all complete. 116 tasks implemented. All tests, typecheck, lint, and build passing.
 
 ## Roadmap
 
@@ -93,3 +93,65 @@
 - M8.9: Context menus (ContextMenu.vue + ContextMenuItem.vue, right-click)
 - M8.10: Scroll position memory (Map per conversation, restore on switch)
 - TEST:M8: All 74 tests pass, typecheck + lint clean
+
+### 2026-03-03 (cont.) — overnight/2026-03-03
+**Completed M9–M20 (all remaining milestones)**:
+
+**M9: AI Experience (10 tasks)**
+- Multi-model comparison, system prompt editor/personas, prompt templates
+- Vision input, response feedback, token/cost estimator
+- AI memory panel, model capabilities badges, temperature sliders, stop sequences
+
+**M10: Advanced Content Renderers (12 tasks)**
+- Full article renderer, PDF viewer (pdfjs-dist), map renderer (Leaflet)
+- Recipe, event, math (KaTeX), Mermaid diagram renderers
+- Audio waveform (WaveSurfer.js), table, timeline, code runner, video (HLS.js)
+
+**M11: Nostr Ecosystem (10 tasks)**
+- Publish notes, DMs NIP-17, relay management, profile editor
+- Zaps NIP-57, NIP-05 verification, NIP-50 search, thread view
+- NIP-51 lists, long-form content NIP-23
+
+**M12: Bitcoin Ecosystem (8 tasks)**
+- On-chain address display, Fedimint ecash, BOLT12 offers
+- NWC (NIP-47), LNURL-auth, live sat/fiat price, mempool viewer, BOLT11 decoder
+
+**M13: Content Discovery (8 tasks)**
+- "For You" feed, content tagging, smart playlists, similar content
+- Recently viewed history, content collections, trending, share to Nostr
+
+**M14: Plugin Marketplace (8 tasks)**
+- Plugin discovery UI, settings panel, permissions, dev mode
+- Wikipedia + OpenLibrary built-in plugins, import by URL, versioning
+
+**M15: Settings & Personalisation (10 tasks)**
+- Accent colour picker, glass intensity slider, font size settings
+- Content visibility toggles, keyboard shortcut map, push notifications
+- Auto-archive, full data export, data wipe, default conversation settings
+
+**M16: Mobile UX Polish (10 tasks)**
+- Bottom sheet component, swipe navigation, pull-to-refresh, haptic feedback
+- Web Share API, pinch-to-zoom, iOS PWA polish, long-press context menus
+- Scroll position memory per route, landscape optimisation
+
+**M17: Accessibility & Internationalisation (8 tasks)**
+- Keyboard nav audit, ARIA audit, high contrast mode, axe-core tests
+- i18n foundation (vue-i18n, en/es/fr), RTL support, dyslexia-friendly font, skip nav
+
+**M18: Performance (8 tasks)**
+- Bundle analysis/splitting, image lazy loading, request deduplication
+- Web Worker for heavy tasks, prefetch on hover, memory leak audit
+- Background sync queue, OPFS storage backend (SQLite WASM)
+
+**M19: Developer Experience & Quality (8 tasks)**
+- Storybook 8, visual regression tests, bundle size CI gate
+- Comprehensive mock data (20+ items per type), E2E cross-browser matrix
+- Proxy integration tests, Lighthouse CI, dependency audit
+
+**M20: Collaboration & Sharing (6 tasks)**
+- Share conversation via Nostr (kind:30023, NIP-44 encryption)
+- Read-only conversation viewer (/view/:nostrAddr)
+- Collaborative playlists (NIP-51), conversation templates
+- Audio podcast export (Web Speech API), community content packs
+
+**FINAL**: All gates passed — 101 tests, 0 typecheck errors, 0 lint errors, build succeeds