feat(thressgame-coverage): Wave 0-1 foundation (ADR + baseline + harness + audits)

Wave 0:
- T0: Architectural decisions (10 sections, 215 lines) + 5-rule paper exercise

Wave 1 (parallel):
- T1: Backward-compat baseline fixture (1961 tests / 167 files snapshot + regression guard)
- T2: Determinism property-test harness (runDeterminismCheck, N=100 default, 1.7s)
- T3: State-hash util (SHA256 of session.allFacts, insertion-order independent)
- T4: Position-attr caller audit (75 prod callsites classified, 17 fixes seeded for T6/T7)
- T5: $var conflict audit (CLEAN — T12 binding shape safe)

Tests: 1961 -> 1970 (+9). bun run check exits 0. No production source modified.
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Joey Yakimowich-Payne 2026-04-26 08:16:26 -06:00
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