feat(P8): IHF Phase 8 complete — Federated Hub Maturity

Implements the final phase of the IHF v0.1 specification:

- WidgetOwnership: delegated ownership registry (local/delegated/global),
  append-only audit artefacts, ownership badge on widget show page
- HubRoutingRule + RoutingEngine: priority-ordered inter-hub routing engine;
  null-inclusive category/widget-type matching; RouteNowAction for manual
  re-evaluation; RoutedCandidates view per hub
- FederatedPolicyOverlay: draft → active → retired lifecycle; activated
  overlays are immutable (same pattern as Phase 6 contracts); policy
  compliance dashboard with decision coverage metrics
- StewardshipRole: named governance roles per hub; point-in-time revocation
  pattern; hub and ops-board integration
- ArchiveRecord + is_archived: soft-delete on widgets; lineage inspector
  traces full traceability chain (Widget → Events → Annotations → Candidates
  → Requirements → Decisions → Deployments → Signals + ArchiveRecord)
- FederatedGovernanceDashboard: 5-panel autoRefresh org-wide governance view
  (ownership coverage, routing activity, policy compliance, stewardship
  coverage, archive activity)

Schema: widget_ownerships, hub_routing_rules, federated_policy_overlays,
stewardship_roles, archive_records; ALTER widgets ADD is_archived;
ALTER requirement_candidates ADD routed_to_hub_id

Migration: 1743638400-ihf-phase8-federated-hub-maturity.sql
Tests: Phase 8 integration tests appended to Test/Integration.hs
Docs: docs/phase8-summary.md; SCOPE.md updated to Phase 8 complete

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

Web/View/FederatedPolicyOverlays/Show.hs

@@ -0,0 +1,70 @@
+module Web.View.FederatedPolicyOverlays.Show where
+
+import Web.Types
+import Generated.Types
+import IHP.Prelude
+import IHP.ViewPrelude
+import Web.View.FederatedPolicyOverlays.Index (statusBadge)
+
+data ShowView = ShowView
+    { overlay :: !FederatedPolicyOverlay
+    , hubs    :: ![Hub]
+    }
+
+instance View ShowView where
+    html ShowView { .. } = [hsx|
+        <div class="max-w-3xl">
+            <div class="flex items-center gap-3 mb-6">
+                <a href={FederatedPolicyOverlaysAction} class="text-sm text-gray-500 hover:underline">Policies</a>
+                <span class="text-gray-300">/</span>
+                <h1 class="text-2xl font-semibold">{overlay.title}</h1>
+                <span class={statusBadge overlay.status <> " text-sm px-2 py-0.5 rounded font-medium"}>
+                    {overlay.status}
+                </span>
+            </div>
+
+            <div class="bg-white rounded-lg border border-gray-200 p-6 space-y-6">
+                <div>
+                    <h2 class="text-sm font-medium text-gray-500 mb-2">Policy Text</h2>
+                    <div class="bg-gray-50 rounded p-4 text-sm text-gray-800 whitespace-pre-wrap">
+                        {overlay.policyText}
+                    </div>
+                </div>
+
+                <dl class="grid grid-cols-2 gap-4 text-sm">
+                    <div>
+                        <dt class="text-gray-500">Enforced From</dt>
+                        <dd>{maybe "–" show overlay.enforcedFrom}</dd>
+                    </div>
+                    <div>
+                        <dt class="text-gray-500">Created</dt>
+                        <dd>{show overlay.createdAt}</dd>
+                    </div>
+                    {whenJust overlay.notes \n -> [hsx|
+                        <div class="col-span-2">
+                            <dt class="text-gray-500">Notes</dt>
+                            <dd class="text-gray-700">{n}</dd>
+                        </div>
+                    |]}
+                </dl>
+            </div>
+
+            <div class="mt-4 flex gap-4">
+                {if overlay.status == "draft"
+                    then [hsx|
+                        <a href={EditFederatedPolicyOverlayAction { federatedPolicyOverlayId = overlay.id }}
+                           class="text-sm text-blue-600 hover:underline">Edit</a>
+                        <a href={ActivateFederatedPolicyAction { federatedPolicyOverlayId = overlay.id }}
+                           class="text-sm text-green-600 hover:underline">Activate</a>
+                    |]
+                    else mempty}
+                {if overlay.status == "active"
+                    then [hsx|
+                        <a href={RetireFederatedPolicyAction { federatedPolicyOverlayId = overlay.id }}
+                           class="text-sm text-red-600 hover:underline"
+                           onclick="return confirm('Retire this policy overlay?')">Retire</a>
+                    |]
+                    else mempty}
+            </div>
+        </div>
+    |]