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>

Application/Schema.sql

@@ -447,3 +447,101 @@ CREATE TABLE cross_hub_propagations (
 
 CREATE INDEX cross_hub_propagations_status_idx ON cross_hub_propagations (status);
 CREATE INDEX cross_hub_propagations_pattern_idx ON cross_hub_propagations (pattern_type);
+
+-- Phase 8: Federated Hub Maturity
+
+-- Explicit ownership record for a widget.
+CREATE TABLE widget_ownerships (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    widget_id UUID NOT NULL REFERENCES widgets(id),
+    owner_hub_id UUID NOT NULL REFERENCES hubs(id),
+    steward_hub_id UUID REFERENCES hubs(id),
+    ownership_type TEXT NOT NULL DEFAULT 'local',
+    -- 'local' | 'delegated' | 'global'
+    effective_from TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now(),
+    effective_until TIMESTAMP WITH TIME ZONE,
+    notes TEXT,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL
+);
+
+CREATE INDEX widget_ownerships_widget_id_idx ON widget_ownerships (widget_id);
+CREATE INDEX widget_ownerships_owner_hub_idx ON widget_ownerships (owner_hub_id);
+CREATE INDEX widget_ownerships_steward_hub_idx ON widget_ownerships (steward_hub_id);
+
+-- Routing rule: automatically routes a RequirementCandidate to another hub.
+CREATE TABLE hub_routing_rules (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    source_hub_id UUID NOT NULL REFERENCES hubs(id),
+    target_hub_id UUID NOT NULL REFERENCES hubs(id),
+    match_category TEXT,
+    match_widget_type TEXT,
+    priority INTEGER NOT NULL DEFAULT 0,
+    status TEXT NOT NULL DEFAULT 'inactive',
+    -- 'active' | 'inactive'
+    notes TEXT,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL
+);
+
+CREATE INDEX hub_routing_rules_source_idx ON hub_routing_rules (source_hub_id);
+CREATE INDEX hub_routing_rules_status_idx ON hub_routing_rules (status);
+
+-- Routing destination on requirement candidates.
+ALTER TABLE requirement_candidates
+    ADD COLUMN routed_to_hub_id UUID REFERENCES hubs(id);
+
+CREATE INDEX requirement_candidates_routed_hub_idx
+    ON requirement_candidates (routed_to_hub_id)
+    WHERE routed_to_hub_id IS NOT NULL;
+
+-- Org-wide policy overlay applied across selected hubs.
+CREATE TABLE federated_policy_overlays (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    title TEXT NOT NULL,
+    policy_text TEXT NOT NULL,
+    applies_to_hubs JSONB NOT NULL DEFAULT '[]',
+    enforced_from TIMESTAMP WITH TIME ZONE,
+    status TEXT NOT NULL DEFAULT 'draft',
+    -- 'draft' | 'active' | 'retired'
+    notes TEXT,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL
+);
+
+CREATE INDEX federated_policy_overlays_status_idx ON federated_policy_overlays (status);
+
+-- Named governance role assigned to a hub.
+CREATE TABLE stewardship_roles (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    hub_id UUID NOT NULL REFERENCES hubs(id),
+    role_name TEXT NOT NULL,
+    assigned_to TEXT NOT NULL,
+    granted_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL,
+    revoked_at TIMESTAMP WITH TIME ZONE,
+    notes TEXT
+);
+
+CREATE INDEX stewardship_roles_hub_id_idx ON stewardship_roles (hub_id);
+CREATE INDEX stewardship_roles_active_idx ON stewardship_roles (revoked_at)
+    WHERE revoked_at IS NULL;
+
+-- Long-term archival entry for any IHF artifact.
+CREATE TABLE archive_records (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    subject_type TEXT NOT NULL,
+    subject_id UUID NOT NULL,
+    archived_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL,
+    reason TEXT NOT NULL,
+    archived_by TEXT NOT NULL,
+    lineage_ref TEXT
+);
+
+CREATE INDEX archive_records_subject_type_idx ON archive_records (subject_type);
+CREATE INDEX archive_records_subject_id_idx ON archive_records (subject_id);
+
+-- Soft-archive flag on widgets.
+ALTER TABLE widgets
+    ADD COLUMN is_archived BOOLEAN NOT NULL DEFAULT FALSE;
+
+CREATE INDEX widgets_is_archived_idx ON widgets (is_archived)
+    WHERE is_archived = TRUE;