docs: sync wiki with current project state
Bring the wiki up to date with the app repo, which had advanced well past
the last wiki update:
- Home/Features: add watchOS companion, music/audiobooks, photos, Live TV,
books (EPUB), CarPlay, system integration (deep links, Handoff, Spotlight,
Siri/App Intents, content-aware Top Shelf), family safety, diagnostics,
SyncPlay. Move watchOS out of "deferred" — it ships today.
- Architecture: add the media-provider boundary (M7), audio vs. video
playback, system integration, watchOS target, diagnostics; ADR list 0001-0010.
- Principles/Contributing: Readium is a second runtime dependency (iOS-only,
EPUB, ADR 0009); note the provider boundary.
- Getting Started/Testing: fix the build-only `A Playa Named Gus` scheme used
for the test action — tests run via the per-platform `Gus <platform> Unit
Tests` schemes; add watch build/test, deployment targets, demo server.
- Roadmap: rebuild milestone table (M0-M9 + M1.5); M7 = Media Server Provider
Architecture, App Store Readiness -> M8, Submission -> M9.
- App Store Readiness: full packet index; privacy manifest now bundled.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
docs: update wiki for A Playa Named Gus
Add project documentation pages