Site v0.3.0 — /track-record/ + /beta/ + scoring engine

Major surface addition. Two new public routes shipped + the methodology engine wired up. /track-record/ — operator's own public dated probabilistic forecasts, scored automatically with Brier (1950) + Murphy (1973) decomposition on resolution; 9 forecasts posted spanning 5 domains (geopolitics, AI benchmarks, markets, technology, weather); aggregate calibration recomputes on every resolution; machine-readable feed at /api/forecasts.json. /beta/ — methodology applied to 10 third-party-published calibration findings across 5 of 6 source classes (human forecasters, aggregator platforms, prediction markets, AI models, analyst firms, scientific papers); cited from peer review and publishers' own metrics — not independently recomputed; review-platform class deferred to Phase 1; machine-readable JSON + BibTeX exports at /api/beta-findings.json + .bib. lib/brier.ts — pure-function scoring engine, math-verified via 9-test suite (Murphy identity holds within 1e-10). The ForecastLens prerequisite #1 is now realised as a calibrationledger.com sub-surface (decision: 2026-04-27, see DECISIONS.md). 12-month track-record clock starts on first resolution (2026-08-02 EU AI Act). 36/36 internal links resolve.