feat(P4): IHF Phase 4 complete — Outcome Observation and Antifragility Loop

Closes the IHF improvement loop. Full antifragility chain now traversable:
Widget → Annotation → Candidate → Requirement → Decision → Deployment → OutcomeSignal

New artifacts:
- DeploymentRecord (immutable, links DecisionRecord to a deployed version)
- OutcomeSignal (append-only; DB trigger prevents UPDATE/DELETE)
- ChangeEvaluation (one-per-deployment; UNIQUE constraint; 1–5 score)

New capabilities:
- DeploymentRecordsController (index, show, new, create)
- RecordOutcomeSignalAction — capture improved/regressed/neutral/inconclusive signals
- Pre/post comparison panel on deployment show (±30-day event/annotation counts)
- Regression detection — improved signal followed by high/critical annotation
- ChangeEvaluation — idempotent score+rationale per deployment
- Recurrence tracking — cycle count per widget, leaderboard
- AntifragilityDashboardAction (autoRefresh, 5 panels) per hub
- Phase 4 integration tests (T01–T08 logic coverage)
- docs/phase4-summary.md; SCOPE.md updated to Phase 4 complete

State Hub: workstream 07e9c860 → completed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Web/Types.hs

@@ -23,8 +23,9 @@ data HubsController
     | EditHubAction             { hubId :: !(Id Hub) }
     | UpdateHubAction           { hubId :: !(Id Hub) }
     | DeleteHubAction           { hubId :: !(Id Hub) }
-    | TriageDashboardAction     { hubId :: !(Id Hub) }
-    | GovernanceDashboardAction { hubId :: !(Id Hub) }
+    | TriageDashboardAction          { hubId :: !(Id Hub) }
+    | GovernanceDashboardAction      { hubId :: !(Id Hub) }
+    | AntifragilityDashboardAction   { hubId :: !(Id Hub) }
     deriving (Eq, Show, Data)
 
 data WidgetsController
@@ -88,6 +89,15 @@ data DecisionRecordsController
     | DeleteImplementationRefAction     { implementationChangeReferenceId :: !(Id ImplementationChangeReference) }
     deriving (Eq, Show, Data)
 
+data DeploymentRecordsController
+    = DeploymentRecordsAction
+    | ShowDeploymentRecordAction      { deploymentRecordId :: !(Id DeploymentRecord) }
+    | NewDeploymentRecordAction
+    | CreateDeploymentRecordAction
+    | RecordOutcomeSignalAction       { deploymentRecordId :: !(Id DeploymentRecord) }
+    | EvaluateChangeAction            { deploymentRecordId :: !(Id DeploymentRecord) }
+    deriving (Eq, Show, Data)
+
 data SessionsController
     = NewSessionAction
     | CreateSessionAction