fix: trust summary resilience, Unicode in reason strings, full GitHub README

tune STALE threshold to 0.50 — better Cat B recall (44% vs 2% at 0.40)

Phase 2.5: wire reliability scorer into critic — edge reliability replaces mean-age STALE threshold

Phase 1.2: fix STALE-before-CONTRADICTED bug — both checks now run, CONTRADICTED wins when both fire

Phase 6: critic agent, 4-verdict taxonomy, contradiction detection, question rewriter

Phase 2: state schema, SQLite session memory, data dir