Studio UX-02/03 gap close (li-studio)¶

Summary¶

Native timeline playback toggle/tick and inspector selection field rows in li-studio, with smokes and runtime playhead state.

Agent continuation¶

1. Read packages/li-studio/src/lib.li — studio_timeline_*, StudioInspectorField, studio_compose_shell(..., scene_entity_count).
2. Run lic check packages/li-studio (or package smokes via lit) after pulling feat/studio-gap-close-wave1.
3. Next: wire host tick to studio_timeline_tick_frame in viewport loop; optional UX-07 viewport empty paint in shell if not already merged upstream.
4. Blocked: none for compose/paint layer.

Changed¶

• packages/li-studio/src/lib.li — li_std_studio_version 5; timeline RT + compose/paint; inspector fields; restored studio_compose_shell_palette with scene_entity_count.
• runtime/li_rt.c, runtime/li_rt.h, compiler/codegen/emit.cpp — timeline mock state.
• packages/li-studio/li-tests/smoke/studio_timeline_playback.li, studio_inspector_fields.li; manifest + panel/cmd count updates.

Not changed¶

• li-ui layout tokens, li-gui keyboard routing, wgpu render path, agent MCP contracts.

Breaking¶

N/A — additive API; studio_compose_shell already takes scene_entity_count on this branch.

Security¶

N/A — UI compose only; no new trusted surface.

Performance¶

N/A — deterministic +0.01 playhead step per tick; no bench delta claimed.

Downstream¶

Branches consuming li-studio should bump version gate to li_std_studio_version() >= 5 for new smokes.