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/View/DecisionRecords/Show.hs

@@ -6,12 +6,14 @@ import IHP.Prelude
 import IHP.ViewPrelude
 
 data ShowView = ShowView
-    { record       :: !DecisionRecord
-    , policyRefs   :: ![PolicyReference]
-    , implRefs     :: ![ImplementationChangeReference]
-    , mRequirement :: !(Maybe Requirement)
-    , mCandidate   :: !(Maybe RequirementCandidate)
-    , users        :: ![User]
+    { record            :: !DecisionRecord
+    , policyRefs        :: ![PolicyReference]
+    , implRefs          :: ![ImplementationChangeReference]
+    , deploymentRecords :: ![DeploymentRecord]
+    , evaluations       :: ![ChangeEvaluation]
+    , mRequirement      :: !(Maybe Requirement)
+    , mCandidate        :: !(Maybe RequirementCandidate)
+    , users             :: ![User]
     }
 
 instance View ShowView where
@@ -92,6 +94,24 @@ instance View ShowView where
                 </form>
             </div>
 
+            <!-- Deployments -->
+            <div class="bg-white rounded-lg border border-gray-200 px-6 py-4">
+                <div class="flex items-center justify-between mb-3">
+                    <h2 class="text-sm font-semibold text-gray-700">Deployments</h2>
+                    {if null implRefs
+                        then mempty
+                        else [hsx|
+                            <a href={(pathTo NewDeploymentRecordAction) <> "?decisionId=" <> show record.id}
+                               class="text-xs border border-indigo-300 text-indigo-600 px-3 py-1 rounded hover:bg-indigo-50">
+                                New Deployment
+                            </a>
+                        |]}
+                </div>
+                {if null deploymentRecords
+                    then [hsx|<p class="text-sm text-gray-400">No deployments recorded yet.</p>|]
+                    else [hsx|{forEach deploymentRecords (renderDeploymentRow evaluations)}|]}
+            </div>
+
             <!-- Implementation references -->
             <div class="bg-white rounded-lg border border-gray-200 px-6 py-4">
                 <h2 class="text-sm font-semibold text-gray-700 mb-3">Implementation References</h2>
@@ -201,6 +221,36 @@ systemBadgeClass "linear" = "bg-violet-100 text-violet-800"
 systemBadgeClass "jira"   = "bg-blue-100 text-blue-800"
 systemBadgeClass _        = "bg-gray-100 text-gray-600"
 
+renderDeploymentRow :: [ChangeEvaluation] -> DeploymentRecord -> Html
+renderDeploymentRow evals dr = [hsx|
+    <div class="flex items-center justify-between py-2 border-b border-gray-100 last:border-0">
+        <div class="flex items-center gap-2 text-sm">
+            <a href={ShowDeploymentRecordAction { deploymentRecordId = dr.id }}
+               class="font-mono text-indigo-600 hover:text-indigo-800">{dr.versionRef}</a>
+            <span class="text-xs text-gray-400">{show dr.deployedAt}</span>
+        </div>
+        {maybe mempty renderEvalSummary mEval}
+    </div>
+|]
+  where
+    mEval = find (\e -> e.deploymentId == dr.id) evals
+
+renderEvalSummary :: ChangeEvaluation -> Html
+renderEvalSummary ev = [hsx|
+    <span class={scoreClass ev.score <> " text-xs px-2 py-0.5 rounded font-medium"}>
+        {starsFor ev.score}
+    </span>
+|]
+
+starsFor :: Int16 -> Text
+starsFor n = pack (Prelude.replicate (fromIntegral n) '★') <> pack (Prelude.replicate (5 - fromIntegral n) '☆')
+
+scoreClass :: Int16 -> Text
+scoreClass n
+    | n <= 2    = "bg-red-100 text-red-800"
+    | n == 3    = "bg-yellow-100 text-yellow-800"
+    | otherwise = "bg-green-100 text-green-800"
+
 userName :: [User] -> Maybe (Id User) -> Text
 userName _     Nothing    = "—"
 userName users (Just uid) = maybe "(unknown)" (.name) (find (\u -> u.id == uid) users)