Law of Trace: "nothing disappears without a trace."
- WorldTrace ECS component (traceType, sourceRunId, glowPhase)
- Death site markers placed at exact death positions (dark red)
- Discovery site markers for runs with 3+ discoveries (blue-gray)
- Deterministic position derivation from world seed
- Traces from current AND previous great cycle included
- Biome filtering, map bounds clamping, glow animation
- 13 new tests (562 total), all passing
Co-authored-by: Cursor <cursoragent@cursor.com>
