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/New.hs

@@ -0,0 +1,27 @@
+module Web.View.FederatedPolicyOverlays.New where
+
+import Web.Types
+import Generated.Types
+import IHP.Prelude
+import IHP.ViewPrelude
+
+data NewView = NewView
+    { overlay :: !FederatedPolicyOverlay
+    , hubs    :: ![Hub]
+    }
+
+instance View NewView where
+    html NewView { .. } = [hsx|
+        <div class="max-w-2xl">
+            <h1 class="text-2xl font-semibold mb-6">New Policy Overlay</h1>
+            {renderForm overlay}
+        </div>
+    |]
+
+renderForm :: FederatedPolicyOverlay -> Html
+renderForm overlay = formFor overlay [hsx|
+    {textField #title}
+    {(textareaField #policyText){ helpText = "Full policy text; once activated this cannot be changed" }}
+    {(textareaField #notes){ label = "Notes (optional)" }}
+    {submitButton}
+|]