feat(ECR-007): Wyckoff Live Structure with Confirmed/Live isolation

Add live.py lifecycle and event candidates; assemble confirmed vs live
in engine; Summary partition; execution_signal source=confirmed only.
Keep strategies untouched; do not lower Confirmed thresholds for Live.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/TEST_REPORT/ECR-007.md

@@ -0,0 +1,32 @@
+# TEST_REPORT — ECR-007
+
+**Date:** 2026-08-07  
+**BD:** BD-2026-007  
+**Loop:** LOOP-RUN-005  
+
+## Commands
+
+```bash
+PYTHONPATH=. python -m pytest tests/test_wyckoff.py -q
+PYTHONPATH=. python -m pytest web/tests/test_analyze_contract.py -q
+```
+
+## Result
+
+```text
+tests/test_wyckoff.py ………… 9 passed
+web/tests/test_analyze_contract.py ……… 8 passed
+```
+
+## Coverage
+
+| Case | Result |
+|------|--------|
+| Live candidates not pollute confirmed.events | PASS |
+| CONFIRMED + execution source=confirmed | PASS |
+| live-only → execution None | PASS |
+| analyze contract keys | PASS |
+
+## Design Compliance
+
+PASS — BD-2026-007; Live ≠ execution; Confirmed thresholds not cut for Live convenience