Normalize stale Patrol acknowledgement state on load

The findings store now clears acknowledgement timestamps that predate a recorded regression when persisted findings are loaded, persists the normalized state, and keeps regression lifecycle metadata explicit.

docs/release-control/v6/internal/subsystems/ai-runtime.md

@@ -511,7 +511,10 @@ Patrol actually succeeds or resolves them for a Patrol-owned reason.
 The shared findings lifecycle must also treat a regressed issue as a new active
 occurrence. When a resolved finding reappears, `internal/ai/findings.go` must
 clear any stale acknowledgement timestamp from the prior occurrence instead of
-carrying that acknowledgement forward onto the regressed active issue.
+carrying that acknowledgement forward onto the regressed active issue. The
+same owner must normalize already-persisted active findings on load when a
+stored acknowledgement predates the last recorded regression, then persist the
+cleaned state back through the canonical findings store.
 AI chat tool-name labels, pending-tool headers, and assistant status copy now
 also route through the shared frontend identifier-label helper, so the chat
 surfaces do not keep their own underscore-stripping behavior separate from

internal/ai/findings.go

@@ -658,6 +658,7 @@ func (s *FindingsStore) SetPersistence(p FindingsPersistence) error {
 		// Reset derived indices/caches before rehydrating.
 		s.byResource = make(map[string][]string)
 		s.activeCounts = make(map[FindingSeverity]int)
+		normalizedLoadedState := false
 		if rules != nil {
 			s.suppressionRules = make(map[string]*SuppressionRule, len(rules))
 			for id, r := range rules {
@@ -672,6 +673,9 @@ func (s *FindingsStore) SetPersistence(p FindingsPersistence) error {
 			if f == nil {
 				continue
 			}
+			if normalizeLoadedFinding(f) {
+				normalizedLoadedState = true
+			}
 			// Ensure derived fields are consistent after load.
 			f.syncLoopState()
 			s.findings[id] = f
@@ -681,6 +685,9 @@ func (s *FindingsStore) SetPersistence(p FindingsPersistence) error {
 			}
 		}
 		s.mu.Unlock()
+		if normalizedLoadedState {
+			s.scheduleSave()
+		}
 	}
 	return nil
 }
@@ -866,6 +873,19 @@ func isAllowedLoopTransition(from, to string) bool {
 	}
 }
 
+func normalizeLoadedFinding(f *Finding) bool {
+	if f == nil {
+		return false
+	}
+
+	if f.ResolvedAt == nil && f.LastRegressionAt != nil && f.AcknowledgedAt != nil && !f.AcknowledgedAt.After(*f.LastRegressionAt) {
+		f.AcknowledgedAt = nil
+		return true
+	}
+
+	return false
+}
+
 // syncLoopStateLocked recomputes loop state and records a lifecycle event if it changed.
 // Caller must hold s.mu.
 func (s *FindingsStore) syncLoopStateLocked(f *Finding) {

internal/ai/findings_coverage_test.go

@@ -78,6 +78,51 @@ func TestFindingsStore_SetPersistence_LoadsFindings(t *testing.T) {
 	}
 }
 
+func TestFindingsStore_SetPersistence_NormalizesRegressedAcknowledgementState(t *testing.T) {
+	store := NewFindingsStore()
+	store.saveDebounce = 5 * time.Millisecond
+	now := time.Now()
+	acknowledgedAt := now.Add(-2 * time.Hour)
+	lastRegressionAt := now.Add(-time.Hour)
+	saved := make(chan map[string]*Finding, 1)
+
+	p := &recordingPersistence{
+		findings: map[string]*Finding{
+			"regressed": {
+				ID:               "regressed",
+				Severity:         FindingSeverityWarning,
+				ResourceID:       "res-3",
+				Title:            "Regressed",
+				LastSeenAt:       now,
+				AcknowledgedAt:   &acknowledgedAt,
+				LastRegressionAt: &lastRegressionAt,
+			},
+		},
+		saved: saved,
+	}
+
+	if err := store.SetPersistence(p); err != nil {
+		t.Fatalf("SetPersistence failed: %v", err)
+	}
+
+	got := store.Get("regressed")
+	if got == nil {
+		t.Fatal("expected finding to load")
+	}
+	if got.AcknowledgedAt != nil {
+		t.Fatal("expected stale acknowledgement to be cleared on load")
+	}
+
+	select {
+	case persisted := <-saved:
+		if persisted["regressed"].AcknowledgedAt != nil {
+			t.Fatal("expected normalized acknowledgement state to be persisted")
+		}
+	case <-time.After(200 * time.Millisecond):
+		t.Fatal("timed out waiting for normalized findings save")
+	}
+}
+
 func TestFindingsStore_scheduleSave_NoPersistence(t *testing.T) {
 	store := NewFindingsStore()