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/Controller/FederatedGovernance.hs

@@ -0,0 +1,43 @@
+module Web.Controller.FederatedGovernance where
+
+import Web.Types
+import Web.View.FederatedGovernance.Dashboard
+import Generated.Types
+import IHP.Prelude
+import IHP.ControllerPrelude
+import Data.Time.Clock (addUTCTime, getCurrentTime)
+import Data.Aeson (decode)
+import qualified Data.ByteString.Lazy as LBS
+import Data.Text.Encoding (encodeUtf8)
+
+instance Controller FederatedGovernanceController where
+    beforeAction = ensureIsUser
+
+    action FederatedGovernanceDashboardAction = autoRefresh do
+        hubs        <- query @Hub |> orderByAsc #name |> fetch
+        widgets     <- query @Widget |> fetch
+        ownerships  <- query @WidgetOwnership |> fetch
+        rules       <- query @HubRoutingRule |> filterWhere (#status, "active") |> fetch
+        now         <- getCurrentTime
+        let thirtyDaysAgo  = addUTCTime (negate $ 30 * 86400) now
+            ninetyDaysAgo  = addUTCTime (negate $ 90 * 86400) now
+        -- Candidates routed cross-hub in last 30 days
+        routedCandidates <- sqlQuery
+            "SELECT * FROM requirement_candidates WHERE routed_to_hub_id IS NOT NULL AND created_at >= ?"
+            (Only thirtyDaysAgo)
+        -- Active overlays
+        overlays    <- query @FederatedPolicyOverlay |> filterWhere (#status, "active") |> fetch
+        -- All decisions for policy compliance check
+        allDecisions <- query @DecisionRecord |> fetch
+        allPolicies  <- query @PolicyReference |> fetch
+        -- Active stewardship roles
+        stewards    <- query @StewardshipRole
+            |> filterWhereSql (#revokedAt, "IS NULL")
+            |> fetch
+        -- Archive records in last 90 days
+        recentArchives <- sqlQuery
+            "SELECT * FROM archive_records WHERE archived_at >= ?"
+            (Only ninetyDaysAgo)
+        render FederatedGovernanceDashboardView
+            { hubs, widgets, ownerships, rules, routedCandidates
+            , overlays, allDecisions, allPolicies, stewards, recentArchives }