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+# QC Report — Physics/ Code Structure & Efficiency
+
+## High Priority
+
+| ID | Issue | Files | Fix |
+|----|-------|-------|-----|
+| H1 | `absDiff` duplicated 4x | DESIInvariant, H0ValveTest, ValveTestSuite, ClusterBHAnchors | Create Shared.lean, use `Int.abs` |
+| H2 | `scale = 65536` duplicated 6x | UniversalBridge, DESIInvariant, DESIModelProjection, ValveTestSuite, ClusterBHAnchors, SuperpositionalBoundaryLayers | Single shared def |
+| H3 | Duplicate theorems | AdjacentCoprimeClassification | 2 redundant (<`fibCond1==fibGcd1`, `ex3Cond1==ex3Gcd1`) |
+| H4 | Dead `q16_div` | DESIModelProjection | Never called, remove |
+
+## Medium Priority
+
+| ID | Issue | Files | Fix |
+|----|-------|-------|-----|
+| M5 | Dead `DESIParam` | DESIInvariant | Remove or annotate |
+| M6 | `q16Abs` = `Int.abs` | DESIModelProjection | Replace with stdlib |
+| M7 | Dead `ModelParams`, `Residual`, `Verdict` structures | DESIModelProjection | 6 defs, no theorems exercise them |
+| M8 | 25 separate theorems | AdjacentCoprimeClassification | Consolidate into `∧` chains per example |
+| M9 | `q16_div` duplicated | UniversalBridge + DESIModelProjection | Share |
+
+## Low Priority
+
+| ID | Issue | Files | Fix |
+|----|-------|-------|-----|
+| L10 | h00/h01 share 4 Q16.16 lines | UniversalBridge | Factor helper |
+| L11 | Q16.16 arithmetic inconsistency | SuperpositionalBoundaryLayers vs UniversalBridge | Unify |
+| L12 | `SCALE` vs `scale` casing | SuperpositionalBoundaryLayers | Standardize |
+| L13 | `rD` field naming | DESIInvariant | `rD` → `rd` |
+| L14 | `rdDr1 = rdDr2 = 147` | DESIInvariant | Store as ×100 |
+
+## Verdict
+
+- 4 high-priority structural issues (duplication + dead code)
+- 5 medium-priority issues (dead structures, consolidation)
+- 5 low-priority issues (consistency, naming)
+- All 8 files build cleanly (3529 jobs)
+- No circular dependencies
+- No efficiency bottlenecks in hot path