docs: add feature reference, bug tracker, and implementation notes
- LOTUS_FEATURES.md: full reference of every custom Lotus feature with implementation details, file paths, and API notes - LOTUS_BUGS.md: audit of confirmed bugs with root causes and fixes - LOTUS_TODO_REFERENCE.md: technical implementation notes for backlog items - LOTUS_TODO.md: trim completed audit results section, link to FEATURES doc - README.md: rewrite to marketing-friendly feature list format; fix incorrect claim that screenshare auto-reverts view to grid (removed) Fix: auto-revert spotlight on screenshare was removed (600ms grid-click caused fullscreen to show avatars); corrected in LOTUS_FEATURES.md and removed from README.md. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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