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/StewardshipRoles/Index.hs

@@ -0,0 +1,81 @@
+module Web.View.StewardshipRoles.Index where
+
+import Web.Types
+import Generated.Types
+import IHP.Prelude
+import IHP.ViewPrelude
+
+data IndexView = IndexView
+    { roles :: ![StewardshipRole]
+    , hubs  :: ![Hub]
+    }
+
+instance View IndexView where
+    html IndexView { .. } = [hsx|
+        <div class="flex items-center justify-between mb-6">
+            <h1 class="text-2xl font-semibold">Stewardship Roles</h1>
+            <a href={NewStewardshipRoleAction}
+               class="text-sm bg-blue-600 text-white px-3 py-1.5 rounded hover:bg-blue-700">
+                Grant Role
+            </a>
+        </div>
+
+        {if null roles
+            then [hsx|<p class="text-sm text-gray-400">No stewardship roles assigned yet.</p>|]
+            else [hsx|
+                <div class="space-y-6">
+                    {forEach hubGroups renderHubGroup}
+                </div>
+            |]}
+    |]
+      where
+        hubName hid = maybe (show hid) (.name) (find (\h -> h.id == hid) hubs)
+        hubGroups   = groupByHub hubs roles
+
+        groupByHub :: [Hub] -> [StewardshipRole] -> [(Hub, [StewardshipRole])]
+        groupByHub hs rs =
+            [ (h, filter (\r -> r.hubId == h.id) rs)
+            | h <- hs
+            , any (\r -> r.hubId == h.id) rs
+            ]
+
+        renderHubGroup :: (Hub, [StewardshipRole]) -> Html
+        renderHubGroup (hub, hubRoles) = [hsx|
+            <div class="bg-white rounded-lg border border-gray-200 overflow-hidden">
+                <div class="bg-gray-50 border-b border-gray-200 px-4 py-3">
+                    <h2 class="font-medium text-gray-700">{hub.name}</h2>
+                </div>
+                <table class="w-full text-sm">
+                    <thead>
+                        <tr>
+                            <th class="text-left px-4 py-2 font-medium text-gray-600">Role</th>
+                            <th class="text-left px-4 py-2 font-medium text-gray-600">Assigned To</th>
+                            <th class="text-left px-4 py-2 font-medium text-gray-600">Granted</th>
+                            <th class="text-left px-4 py-2 font-medium text-gray-600">Status</th>
+                            <th class="px-4 py-2"></th>
+                        </tr>
+                    </thead>
+                    <tbody class="divide-y divide-gray-100">
+                        {forEach hubRoles renderRoleRow}
+                    </tbody>
+                </table>
+            </div>
+            |]
+
+        renderRoleRow :: StewardshipRole -> Html
+        renderRoleRow r = [hsx|
+            <tr class="hover:bg-gray-50">
+                <td class="px-4 py-3 font-medium text-gray-800">{r.roleName}</td>
+                <td class="px-4 py-3 text-gray-600">{r.assignedTo}</td>
+                <td class="px-4 py-3 text-xs text-gray-400">{show r.grantedAt}</td>
+                <td class="px-4 py-3">
+                    {if isNothing r.revokedAt
+                        then [hsx|<span class="text-xs bg-green-100 text-green-700 px-2 py-0.5 rounded font-medium">active</span>|]
+                        else [hsx|<span class="text-xs bg-gray-100 text-gray-500 px-2 py-0.5 rounded font-medium">revoked</span>|]}
+                </td>
+                <td class="px-4 py-3 text-right">
+                    <a href={ShowStewardshipRoleAction { stewardshipRoleId = r.id }}
+                       class="text-xs text-blue-600 hover:underline">View</a>
+                </td>
+            </tr>
+            |]