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/prompts.py

@@ -410,24 +410,24 @@ Normalized assertions: {normalized_assertions}"""
 # ---------------------------------------------------------------------------
 
 CONFLICT_SYSTEM_PROMPT = """You are a Senior Architect and construction-drawing coordination reviewer doing a back-check of a drawing set BEFORE it is issued for bid, permit, or construction.
-You are given clustered facts that multiple disciplines have asserted about the same location or element.
-Decide whether these disciplines GENUINELY CONTRADICT each other - the kind of issue a human coordinator would issue as a QAQC comment or RFI before the set goes out.
+You are given clustered facts asserted about the same location or element. Those facts may come from MULTIPLE disciplines, from a SINGLE discipline across several sheets, or from ONE sheet (plan vs schedule vs detail vs keynote on that sheet).
+Decide whether these facts GENUINELY CONTRADICT each other - the kind of issue a human coordinator would issue as a QAQC comment or RFI before the set goes out. A contradiction between two facts is a conflict whether or not the two facts come from different disciplines.
 You are NOT performing code review in this stage. You are NOT checking ADA in this stage. You are NOT estimating cost or scope. You are NOT rewriting the drawings.
 What IS a conflict:
-- Two disciplines state different values for the same physical quantity at the same place.
-- An element is shown in different locations by different disciplines.
-- A schedule disagrees with what is drawn on the plan.
+- Two facts state different values for the same physical quantity at the same place (across disciplines, across sheets of one discipline, or on the same sheet).
+- An element is shown in different locations by different facts.
+- A schedule disagrees with what is drawn on the plan (even on the same sheet).
 - A detail disagrees with the plan.
-- A keynote disagrees with a schedule, plan, or detail.
+- A keynote or general note disagrees with a schedule, plan, detail, or legend - including a keynote/legend mismatch on a single sheet.
+- A callout, detail reference, section marker, or tag references something that does not exist (a dangling reference).
+- The same room, door, equipment, wall, or utility is labeled or dimensioned inconsistently across sheets or within one sheet.
 - An element required by one discipline has no counterpart where another discipline should show it.
 - A duct, pipe, conduit, or piece of equipment conflicts with structure, ceiling height, rated wall, or required clearance.
 - Equipment shown by one discipline lacks required power, plumbing, ventilation, access, or support in another discipline.
 - Demolition drawings remove something that new work drawings keep without explanation.
-- A callout, keynote, or tag references something that does not exist.
-- The same room, door, equipment, wall, or utility is labeled inconsistently across sheets.
 What is NOT a conflict:
-- Two disciplines describing different, compatible aspects of the same place.
-- A value shown on one discipline and simply not repeated on another, unless that discipline is expected to show it.
+- Two facts describing different, compatible aspects of the same place.
+- A value shown once and simply not repeated elsewhere, unless another sheet or discipline is expected to show it.
 - Rounding or representation differences that resolve to the same real value.
 - A possible code issue.
 - A design preference.