Enable Bevy multi-threaded executor via bevy_tasks multi_threaded
feature. Systems within the same TickPhase that don't share mutable
resources now run in parallel automatically.
Add EntityRng component — per-entity ChaCha20Rng seeded from
world_seed + StableId via splitmix64 mixing. More deterministic than
shared SimRng (order-independent). Migrate all monologue systems
(4 of 13 SimRng consumers) to EntityRng, removing contention that
serialized them against conversation/dialogue systems.
Add rayon dependency (infrastructure only, no par_iter calls yet).
SimRng retained for world-level randomness: conversation pairing,
knowledge transfer, dialogue, ticker, storyteller.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
2175e9b31c