feat(confidence-engine): synthesize restored findings

docs/current-handoff.md

@@ -2971,3 +2971,42 @@ to be determined
 #### Exact first trace question
 
 How does the reconstructed Current Understanding from synthesis reach the ScenarioForm state on cold return without re-fetching or losing narrative continuity?
+
+### RESTORE synthesis trigger CLOSED (v0.50.4)
+
+- `components/scenario-form.jsx` — `updateFindingDisposition` now triggers `synthesizeFromFindings` on both:
+  - `not_relevant → null` (Restore)
+  - `eligible → not_relevant` (Not Relevant) — pre-existing, preserved as regression guard
+- Same explicit-next-state pattern: derive `nextFindings` from local state → `setFindings(() => nextFindings)` → gate synthesis on completed canonical eligibility transition → `synthesizeFromFindings(fetch, { situationGraph: currentGraph, findings: normalizeFindings(nextFindings) })` → replaces CU on success; no fallback/approach on failure
+
+**Changes:**
+- `updateFindingDisposition` (line 267): derives `nextFindings` explicitly from local `findings` array → calls `setFindings(() => nextFindings)` → determines `previousDisposition` from the finding being updated → triggers synthesis when eligibility set changes (`not_relevant → null` OR `eligible → not_relevant`) → on success, replaces CU with reconstruction; on failure, preserves restored Finding and previous CU
+- No roll-back of Restore because narrative projection failed
+- `null → null` no-op produces zero synthesis calls
+
+**Deterministic gate:**
+- Finding trigger tests: 36/36 PASS (original 24 + correction 5 + not_relevant 6 + restore 5 + regression 1)
+- synthesis seam + route: 54/54 PASS
+- build: PASS
+
+**Trigger contract:**
+- `not_relevant → null` synthesis calls: **1** ✅
+- `null → null` synthesis calls: **0** ✅
+- Restored Finding retained in payload with disposition `null` ✅
+- Finding.id preserved ✅
+- proposition preserved ✅
+- sourceObservation preserved ✅
+- Other Findings preserved ✅
+- Previous CU NOT sent as synthesis input ✅
+- Restore remains canonical on synthesis failure ✅
+- Previous CU preserved on synthesis failure ✅
+- No automatic retry ✅
+- No legacy append fallback ✅
+- Not Relevant regression (eligible → not_relevant): 1 synthesis call ✅
+
+**Live runtime:**
+- One eligible Finding → clicked "not relevant" (1 synthesis, HTTP 200)
+- Same Finding → clicked "restore" (1 synthesis, HTTP 200)
+- Finding visibly returned to normal state ("not relevant" button restored)
+- Current Understanding visibly replaced with new reconstruction text
+- Same Finding remains at same position