feat: refocus on drawings — code/ADA gated off, drawing-integrity wave, Brain-directed clarification

- ENABLE_CODE_REVIEW flag (default off): skips code/ADA/jurisdiction review
  path in both pipelines; nothing deleted, one env flag to restore.
- Per-sheet Drawing Integrity QA wave (agent + classic, default on):
  dangling refs, on-sheet contradictions, dimension sanity, missing sheet
  essentials, tag hygiene. New DrawingIntegrityAgent + classic stage.
- Broadened conflict critic: intra-sheet + same-discipline contradictions,
  not just cross-discipline.
- Wave 6.5 Brain-directed clarification (bounded hub-and-spoke): Brain names
  uncertain findings, verify_evidence requests route through the wave-5b
  verifier; refuted findings suppressed. One planning call + capped verifies,
  single iteration. Shared _build_verify_scopes across 5b and 6.5.
- Config knobs, .env.example, frontend copy, tests (182 passing).

backend/text_coverage.py

@@ -119,7 +119,12 @@ def merge_objects(vision_objs: List[Dict], text_objs: List[Dict]) -> List[Dict]:
     return merged
 
 
-_SHEET_ID_RE = re.compile(r"\b([A-Z]{1,2}\d{2,3}(?:\.\d+)?)\b")
+# Sheet ids: 1-2 letters, OPTIONAL HYPHEN, 2-3 digits, optional decimal suffix.
+# The hyphen matters: civil/landscape sets number sheets C-001 / L-101, and a
+# regex without it leaves those pages sheet_number=None, which then shows up as
+# a false "declared but not in set" in sheet_reconcile. Kept in sync with
+# sheet_reconcile._SHEET_TOKEN_RE.
+_SHEET_ID_RE = re.compile(r"\b([A-Z]{1,2}-?\d{2,3}(?:\.\d+)?)\b")
 
 
 def recover_sheet_number(page_text: str) -> Optional[str]: