Summary:
This update introduces multi-threaded simulation dispatch, allowing independent subsystems and creature updates to run in parallel across worker threads with automatic core detection and graceful fallback on low-end hardware. Several player-reported bugs were fixed: ESC now properly closes build menus before pausing, audio no longer screeches during mass attacks, and Steam achievements unlock correctly again. The frenzy particle system was also reworked with per-organism staggered emission, reduced counts, and improved fade timings.

Changes:

1. Fixed ESC key not properly closing build menus before pausing

2. Fixed audio screeching when many entities attack simultaneously

3. Reworked frenzy particle system — per-organism staggered emission instead of global bursts, removed particle cap, reduced particle counts, and fixed fade timings

4. Added multi-threaded simulation dispatch — independent subsystems now run in parallel across worker threads

5. Threading auto-detects CPU core count and gracefully falls back to sequential on low-end hardware with a warmup grace period

6. Added parallel creature updates with thread-safety guards for shared data

7. Fixed race conditions in the thread pool's task dispatch

8. Fixed Steam achievements never unlocking due to a missing stats request call