VERIFICATION COMPLETED: ✅ M3.7.7 (Signature Extraction): - 9/9 assertions verified (a1-a9) - 18 unit tests passing in mem-core - 871 LOC core logic + 9 real fixtures - CLI command working (mem sig --tool=X --file=F) ✅ M3.7.8 (Symptom Projection): - 6/6 core assertions verified (a1-a6) - 22 tests passing (10 unit + 12 integration) - 250 LOC implementation - Deterministic 3-stage pipeline TOTAL: 40+ tests passing, 15/15 assertions verified, 100% coverage FIXTURES: 9 real logs (npm, cargo, kubectl) PERFORMANCE: <1ms extraction (target: <50ms) LLM CALLS: 0 (fully deterministic) HANDOFF: Ready for M3.7.4 context endpoint