feat(forecasting): demand-supply forecast engine (#980, 952-A §9.7)
Assemble merged §9.x services into per-(segment×horizon) DemandSupplyForecast:
demand (§9.2 pace × §9.4 norm × §9.5 macro, linear no-compound) vs supply
(open + phased hidden h/18 + future_online − absorbed, §9.3) → balance /
deficit_index[-1,+1] + §9.7 future competitors. Pure synthesis, no §9.x math
rebuilt; β counted EXACTLY ONCE (via §9.4 only; rate_sensitivity surfaced for
phrase only; §9.5 orthogonal). Supply net clamped ≥0; deficit_index None on
supply≤0 (no fake infinite deficit). confidence=MIN(components) capped medium;
advisory=True always. Deterministic, no LLM, no SQL, un-wired. 89 unit tests
(pure helpers + mocked orchestrator incl. adversarial β-once test), all green.
Light1YT
f3b04331f4