fforge-core 0.1.0

fm-core — layer 2: the deterministic simulation core.

Hard invariants enforced here (DESIGN.md):

• the core is a pure fold over an append-only event log (state);
• no wall clock (game-time derives from events — GameDate moves only via MatchdayAdvanced), no unseeded randomness (rng streams derive from the seed recorded in GameStarted), no inline LLM calls (none exist yet; when they do, their outputs arrive as recorded events);
• the evaluation/telemetry spine is a passive event-stream consumer (observer).