[sync1] wire TimelineUI to real Stage, null-mixer guard, M2 unlock + orchestrator updates
- index.html: mount TimelineUI, setMixerAuto(false) when timeline present
- timeline.js: _evalClips guards no-blocks / null-mixer (real Stage returns
null for non-characters; the stub never did)
- tldev.html removed; stagestub.js kept as the node-test fixture
- lane files: M1 accepted for all three, answers to open questions, M2
priorities (A: clipdrop event, PiP; B: row/scene-bar refresh; C: straight
into M3 render pipeline)
- SCENEGOD launch.json (informational; preview uses MESHGOD's entry)
SYNC 1 verified in-browser: character+backdrop+retargeted clip scene loads,
scrub interpolates frame-exact, scene save/load round-trips via server.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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