R04: separate player and world animation clocks

[hoainho]

Refs #25

Scope

• Aren finite actions and loop sampling use the simulation clock; non-player actors and contextual traversal retain scaled world time.
• EngineState schema v3 migrates v2 live/checkpoint player samples while preserving normalized progress.
• Renderer loops use authoritative actor clock and loaded clip duration; finite clips remain snapshot-sampled.
• Combat contract docs and deterministic/browser smoke coverage updated.

Review

• Independent Astra spec review: SPEC_OK for combat and renderer slices.
• Independent Astra code-quality review: QUALITY_OK for both slices.

Verification

• tsc --noEmit: pass.
• Focused combat tests: 21 pass, 225 assertions.
• Full Bun suite: 565 pass, 1,507 assertions.
• Production build: pass; Vite still reports 504.94 kB and 568.75 kB chunks above its 500 kB warning threshold.
• Chromium renderer smoke: pass, zero page errors; existing Three.js skinning warnings remain.
• App lifecycle smoke: all seven checks pass; failure is null and cleanup is true.
• Development route and built preview both fail closed on the real greenwake-environment gate after New Game.

Readiness

NOT READY FOR USER TEST. greenwake-environment is blocked with no runtime URL or native GLB. P6 actors lack required production native GLBs/clip mappings; only Aren/Asha concept crops are approved and neither is model-ready or authorized for provider dispatch. Per-asset rights/Tripo grants or supplied native GLBs with provenance, workspace host-image consent, an official Jev harness at least 0.2.5, and native rig/root-motion/contact evidence remain prerequisites. This is a verified clock increment, not P6 acceptance; keep #25 open.