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+---
+id: IHUB-WP-0011
+type: workplan
+title: "IHF Phase 10 — Hub Registry and Widget Marketplace"
+domain: inter_hub
+repo: inter-hub
+status: todo
+owner: custodian
+topic_slug: inter_hub
+created: "2026-04-01"
+updated: "2026-04-01"
+state_hub_sync: done
+state_hub_workstream_id: "bc81e097-e91c-4750-80b6-c809ebcf7ef9"
+---
+
+# IHF Phase 10 — Hub Registry and Widget Marketplace
+
+## Goal
+
+Enable reuse of proven widget patterns, governance templates, and hub
+configurations across deployments. Phase 9 made the IHF externally consumable.
+Phase 10 makes it composable: hubs and widgets can be discovered, rated,
+adopted, and evolved as shared platform assets.
+
+## Background
+
+Phases 1–9 and IHUB-WP-0009 (GAAF Compliance Foundation) are complete. All
+Phase 10 entry gates are satisfied:
+
+- `HubCapabilityManifest` table and activation workflow operational ✓
+- Four type registries seeded and validated ✓
+- `/api/v2/` REST API with OpenAPI 3.1 spec live ✓
+- `HubHealthSnapshot` data available ✓
+- ARCHITECTURE-LAYERS.md scorecard at 3.41 (approaching Strong) ✓
+- Architectural fitness functions in CI ✓
+
+Phase 10's Hub Registry IS the `HubCapabilityManifest` table with a public-facing
+discovery UI. No new hub registry table is required. The data already exists;
+Phase 10 adds browsability, pattern publishing, and adoption mechanics.
+
+Reference: `specs/InteractionHubFrameworkSpecification_v0.2.md` §Phase 10.
+
+## GAAF Architectural Constraints
+
+All new code in this workplan must comply with:
+
+1. **No bare TEXT type discriminators** — any new type discriminator column must
+   FK to a registry table or carry a CHECK constraint.
+2. **WidgetPattern.widget_type must FK to widget_type_registry** — no unregistered
+   widget types may be referenced by a pattern.
+3. **GovernanceTemplate categories must FK to annotation_category_registry** —
+   template categories are registered vocabulary, not free text.
+4. **Core tables are frozen** — `widgets`, `interaction_events`, `annotations`,
+   `hubs`, and Phase 1–4 dependents must not gain columns without a corresponding
+   `/contracts/core/` update.
+5. **Append-only invariant is permanent** — no migration may add UPDATE or DELETE
+   capability to `interaction_events` or `outcome_signals`.
+6. **Manifest amendment is the extension mechanism** — when a hub adopts a pattern
+   or governance template that introduces new types, those types must be added to
+   the hub's `HubCapabilityManifest` via a draft amendment, not inserted directly
+   into the registry.
+
+## Data Artifacts Introduced
+
+`WidgetPattern`, `WidgetPatternVersion`, `PatternAdoption`, `GovernanceTemplate`,
+`GovernanceTemplateClone`
+
+Note: No `HubRegistry` table — the hub registry is a view over existing
+`hub_capability_manifests`, `hub_health_snapshots`, and `hubs` tables.
+
+Schema additions:
+
+```sql
+-- widget_patterns: reusable widget definitions tied to registered types
+CREATE TABLE widget_patterns (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    hub_id UUID NOT NULL REFERENCES hubs(id),
+    name TEXT NOT NULL,
+    description TEXT,
+    widget_type TEXT NOT NULL REFERENCES widget_type_registry(name),
+    is_cross_hub BOOLEAN NOT NULL DEFAULT FALSE,
+    is_published BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL
+);
+
+-- widget_pattern_versions: explicit version history
+CREATE TABLE widget_pattern_versions (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    widget_pattern_id UUID NOT NULL REFERENCES widget_patterns(id) ON DELETE CASCADE,
+    version_number INTEGER NOT NULL,
+    definition JSONB NOT NULL,  -- widget envelope definition snapshot
+    changelog TEXT,
+    published_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
+    UNIQUE (widget_pattern_id, version_number)
+);
+
+-- pattern_adoptions: which hubs have adopted which patterns
+CREATE TABLE pattern_adoptions (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    widget_pattern_id UUID NOT NULL REFERENCES widget_patterns(id),
+    adopting_hub_id UUID NOT NULL REFERENCES hubs(id),
+    pinned_version_id UUID REFERENCES widget_pattern_versions(id),
+    is_version_pinned BOOLEAN NOT NULL DEFAULT FALSE,
+    is_anonymous BOOLEAN NOT NULL DEFAULT FALSE,  -- opt-out of aggregate feedback
+    adopted_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
+    UNIQUE (widget_pattern_id, adopting_hub_id)
+);
+
+-- governance_templates: requirement distillation and decision templates
+CREATE TABLE governance_templates (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    hub_id UUID NOT NULL REFERENCES hubs(id),
+    name TEXT NOT NULL,
+    description TEXT,
+    -- categories: array of annotation_category_registry names this template uses
+    -- Stored as JSONB array; each element must exist in annotation_category_registry
+    categories JSONB NOT NULL DEFAULT '[]',
+    template_body JSONB NOT NULL,  -- structured template definition
+    is_published BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL
+);
+
+-- governance_template_clones: adoption record for governance templates
+CREATE TABLE governance_template_clones (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    governance_template_id UUID NOT NULL REFERENCES governance_templates(id),
+    cloning_hub_id UUID NOT NULL REFERENCES hubs(id),
+    cloned_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
+    UNIQUE (governance_template_id, cloning_hub_id)
+);
+```
+
+---
+
+## Tasks
+
+### T01 — Schema: WidgetPattern, WidgetPatternVersion, PatternAdoption, GovernanceTemplate, GovernanceTemplateClone
+
+```task
+id: IHUB-WP-0011-T01
+status: todo
+priority: high
+state_hub_task_id: "9c26859d-d910-4c5d-a684-3d94ea8019d9"
+```
+
+Add all Phase 10 tables to `Application/Schema.sql` and write a migration.
+
+**GAAF constraints:**
+- `widget_patterns.widget_type` must FK to `widget_type_registry(name)` — not
+  TEXT, not CHECK, but a true FK to the registry
+- `governance_templates.categories` is JSONB; validate each element against
+  `annotation_category_registry` in the controller layer (array FK not expressible
+  in SQL; controller validates at write time)
+- No `HubRegistry` table — registry is a query over existing tables
+
+**Migration file:** `Application/Migration/<timestamp>-ihf-phase10-hub-registry.sql`
+
+Run `migrate` after writing.
+
+---
+
+### T02 — Hub Registry UI: browsable view over manifests + health snapshots + GAAF compliance indicator
+
+```task
+id: IHUB-WP-0011-T02
+status: todo
+priority: high
+state_hub_task_id: "718b93a7-4e0a-4f79-af15-53af13ef9a92"
+```
+
+**Controller:** `Web/Controller/HubRegistry.hs`
+
+**Query:**
+```sql
+SELECT h.id, h.name, h.hub_kind, h.domain,
+       m.id AS manifest_id, m.status AS manifest_status,
+       m.declared_widget_types, m.declared_event_types,
+       m.declared_annotation_categories, m.declared_policy_scopes,
+       s.overall_score, s.snapshot_taken_at
+FROM hubs h
+LEFT JOIN hub_capability_manifests m
+    ON m.hub_id = h.id AND m.status = 'active'
+LEFT JOIN LATERAL (
+    SELECT overall_score, snapshot_taken_at
+    FROM hub_health_snapshots
+    WHERE hub_id = h.id
+    ORDER BY snapshot_taken_at DESC LIMIT 1
+) s ON TRUE
+ORDER BY h.name
+```
+
+**GAAF compliance indicator per hub:**
+- Has active manifest: `manifest_status = 'active'`
+- Registered type count: length of each `declared_*` JSONB array
+- Fitness function status: derive from `m.declared_widget_types` completeness
+  (flag if hub has widgets not in registry — approximate; full check is in CI)
+
+**Views:** `Web/View/HubRegistry/Index.hs`, `Web/View/HubRegistry/Show.hs`
+(Show renders full manifest vocabulary + health history + adopted patterns)
+
+Add route and nav link.
+
+---
+
+### T03 — Widget Pattern Library: publish, list, show with version history
+
+```task
+id: IHUB-WP-0011-T03
+status: todo
+priority: high
+state_hub_task_id: "5d2ce269-25de-4251-afae-0478901f85f6"
+```
+
+**Controller:** `Web/Controller/WidgetPatterns.hs`
+
+Actions:
+- `WidgetPatternsAction` — list all published patterns with adopter count
+- `ShowWidgetPatternAction { widgetPatternId }` — detail with version history
+- `NewWidgetPatternAction` — form (hub selector, widget_type from registry)
+- `CreateWidgetPatternAction` — validate `widget_type` exists in
+  `widget_type_registry`; if owned by a different hub, set `is_cross_hub = True`
+- `EditWidgetPatternAction { widgetPatternId }` / `UpdateWidgetPatternAction`
+- `PublishWidgetPatternAction { widgetPatternId }` — set `is_published = True`,
+  creates first `WidgetPatternVersion` with `version_number = 1`
+
+**Cross-hub type check:**
+```haskell
+typeOwner <- query @WidgetTypeRegistry
+    |> filterWhere (#name, pattern.widgetType)
+    |> fetchOne
+let isCrossHub = typeOwner.hubId /= Just pattern.hubId
+```
+
+**Views:** `Web/View/WidgetPatterns/{Index,Show,New,Edit}.hs`
+
+---
+
+### T04 — Pattern versioning: WidgetPatternVersion with pin/follow-latest per adoption
+
+```task
+id: IHUB-WP-0011-T04
+status: todo
+priority: medium
+state_hub_task_id: "33003835-48fd-45d1-addd-75db85340968"
+```
+
+**Actions to add to `WidgetPatterns` controller:**
+
+- `PublishNewVersionAction { widgetPatternId }` — form asks for `definition`
+  (JSONB) and `changelog`; increments `version_number`; creates
+  `WidgetPatternVersion` record
+- Show page lists all versions in descending order
+
+**Adoption version choice:**
+
+In `AdoptPatternAction` (T05), offer two options:
+1. Follow latest — `is_version_pinned = False`, `pinned_version_id = Nothing`
+2. Pin to current — `is_version_pinned = True`, `pinned_version_id = currentVersionId`
+
+Show pinned vs follow-latest status in the adopter hub's pattern list.
+
+---
+
+### T05 — Pattern adoption workflow: adopt pattern, trigger manifest amendment draft
+
+```task
+id: IHUB-WP-0011-T05
+status: todo
+priority: high
+state_hub_task_id: "44b354ac-b94a-4c71-9c43-79f5e67f671f"
+```
+
+**Action:** `AdoptPatternAction { widgetPatternId }` in `WidgetPatterns` controller.
+
+```haskell
+-- 1. Resolve adopting hub (from session user's hub)
+-- 2. Create PatternAdoption record
+adoption <- newRecord @PatternAdoption
+    |> set #widgetPatternId widgetPatternId
+    |> set #adoptingHubId hubId
+    |> set #isAnonymous (param "isAnonymous")
+    |> createRecord
+
+-- 3. Check if pattern's widget_type is in the hub's manifest
+manifest <- query @HubCapabilityManifest
+    |> filterWhere (#hubId, hubId)
+    |> filterWhere (#status, "active")
+    |> fetchOneOrNothing
+
+let needsAmendment = case manifest of
+        Nothing -> True
+        Just m  -> not (pattern.widgetType `elem` m.declaredWidgetTypes)
+
+-- 4. If amendment needed, create draft manifest
+when needsAmendment $ do
+    let newTypes = maybe [pattern.widgetType]
+                         (\m -> m.declaredWidgetTypes ++ [pattern.widgetType])
+                         manifest
+    _draft <- newRecord @HubCapabilityManifest
+        |> set #hubId hubId
+        |> set #status "draft"
+        |> set #declaredWidgetTypes newTypes
+        -- ... carry over other declared types from existing manifest
+        |> createRecord
+    setSuccessMessage "Pattern adopted. A manifest amendment draft has been created — please review and activate it."
+    redirectTo (ShowHubCapabilityManifestAction draftId)
+```
+
+When no amendment is needed, redirect to hub's pattern list with success message.
+
+---
+
+### T06 — Governance Template Library: CRUD and clone with manifest amendment
+
+```task
+id: IHUB-WP-0011-T06
+status: todo
+priority: medium
+state_hub_task_id: "f31b86d3-573e-4a87-b179-609872565b0c"
+```
+
+**Controller:** `Web/Controller/GovernanceTemplates.hs`
+
+Actions:
+- `GovernanceTemplatesAction` — list published templates with clone count
+- `ShowGovernanceTemplateAction { governanceTemplateId }` — detail with clones
+- `NewGovernanceTemplateAction` / `CreateGovernanceTemplateAction` — validate
+  each category in the `categories` JSONB array exists in
+  `annotation_category_registry`
+- `CloneGovernanceTemplateAction { governanceTemplateId }` — creates
+  `GovernanceTemplateClone`; checks each template category against the cloning
+  hub's `declared_annotation_categories`; if any missing, creates manifest
+  amendment draft with the new categories added
+
+**Category validation helper:**
+```haskell
+validateCategories :: [Text] -> IO (Either [Text] ())
+validateCategories cats = do
+    registered <- query @AnnotationCategoryRegistry
+        |> filterWhere (#isActive, True)
+        |> fetch
+    let known = map (.name) registered
+    let unknown = filter (`notElem` known) cats
+    pure $ if null unknown then Right () else Left unknown
+```
+
+**Views:** `Web/View/GovernanceTemplates/{Index,Show,New}.hs`
+
+---
+
+### T07 — Adoption tracking and aggregate friction/outcome view per pattern
+
+```task
+id: IHUB-WP-0011-T07
+status: todo
+priority: medium
+state_hub_task_id: "5642dd12-4255-42d7-9411-63e032cc2b57"
+```
+
+**On pattern Show page**, add aggregate panel (only for non-anonymous adopters):
+
+```sql
+SELECT
+    COUNT(pa.id)                          AS adopter_count,
+    AVG(fs.score)                         AS mean_friction_score,
+    COUNT(os.id)                          AS outcome_signal_count
+FROM pattern_adoptions pa
+JOIN widgets w
+    ON w.hub_id = pa.adopting_hub_id
+    AND w.widget_type = ?  -- pattern's widget_type
+LEFT JOIN friction_scores fs
+    ON fs.widget_id = w.id
+LEFT JOIN outcome_signals os
+    ON os.widget_id = w.id
+WHERE pa.widget_pattern_id = ?
+  AND pa.is_anonymous = FALSE
+```
+
+Show:
+- Adopter count (total, including anonymous)
+- Mean friction score across non-anonymous adopter hubs (NULL if none)
+- Outcome signal count
+- "N hubs opted out of aggregate feedback" note if `is_anonymous` count > 0
+
+**Hub's adopted patterns list** (`Web/View/HubRegistry/Show.hs`): list all
+`PatternAdoption` records for the hub with pinned/follow-latest status.
+
+---
+
+### T08 — Marketplace dashboard: search and browse patterns and templates
+
+```task
+id: IHUB-WP-0011-T08
+status: todo
+priority: medium
+state_hub_task_id: "01ea4d7d-cbd3-4149-b772-7e131f4f7e9c"
+```
+
+**Controller:** `Web/Controller/MarketplaceDashboard.hs`
+
+Use `autoRefresh`. Two sections:
+
+**Widget Patterns:**
+- Full-text search: `WHERE to_tsvector('english', wp.name || ' ' || COALESCE(wp.description,'')) @@ plainto_tsquery(?)`
+- Filter by `widget_type` (dropdown from `widget_type_registry`)
+- Sort: Most adopted (default) | Recently published | Alphabetical
+- Trending: most `pattern_adoptions` created in last 30 days
+
+**Governance Templates:**
+- Same search pattern over `governance_templates.name + description`
+- Filter by category
+- Sort: Most cloned | Recent | Alphabetical
+
+**Layout:** Two-column tab layout (Widget Patterns | Governance Templates).
+Hub Registry link at top of page.
+
+**Views:** `Web/View/MarketplaceDashboard/Show.hs`
+
+Add route and nav link ("Marketplace").
+
+---
+
+### T09 — API v2: hub registry and widget pattern endpoints
+
+```task
+id: IHUB-WP-0011-T09
+status: todo
+priority: medium
+state_hub_task_id: "34d3339a-cf17-4475-b848-eeb077ede8e6"
+```
+
+Add to `/api/v2/` surface (all behind `requireApiConsumer` + `checkRateLimitAndLog`):
+
+**Endpoints:**
+
+| Method | Path | Description |
+|---|---|---|
+| GET | `/api/v2/hub-registry` | List hubs with active manifest summary + GAAF indicator |
+| GET | `/api/v2/hub-registry/:hubId` | Single hub detail (manifest vocabulary, health) |
+| GET | `/api/v2/widget-patterns` | List published patterns (paginated) |
+| GET | `/api/v2/widget-patterns/:id` | Pattern detail with version history |
+| POST | `/api/v2/widget-patterns/:id/adopt` | Create PatternAdoption for authenticated consumer's hub |
+
+**New controllers:**
+- `Web/Controller/Api/V2/HubRegistry.hs`
+- `Web/Controller/Api/V2/WidgetPatterns.hs`
+
+**OpenAPI update:** Add paths to `Web/Controller/Api/V2/OpenApi.hs`. The
+`widget_type` enum in widget pattern responses continues to reference the live
+registry query (no hardcoding).
+
+**Routes and Types:** Update `Web/Routes.hs` and `Web/Types.hs` for new actions.
+
+---
+
+### T10 — ARCHITECTURE-LAYERS.md scorecard update + exit criteria validation
+
+```task
+id: IHUB-WP-0011-T10
+status: todo
+priority: medium
+state_hub_task_id: "9af8cd05-7864-438d-92a2-052d0af3bcbc"
+```
+
+**Exit criteria checklist (from v0.2 spec §Phase 10):**
+
+- [ ] Hub registry renders all registered hubs with active manifest vocabulary
+      and current health score
+- [ ] Widget pattern library lists published patterns with version history;
+      each pattern's widget_type links to its registry entry
+- [ ] A pattern can be published from one hub and adopted into another;
+      adoption triggers manifest amendment draft when new types are introduced
+- [ ] Adoption tracking shows which hubs use which patterns
+- [ ] Governance template cloning works end-to-end; new categories appear in
+      the adopting hub's manifest amendment
+- [ ] Marketplace dashboard renders search and browse
+- [ ] Hub registry GAAF compliance indicator renders correctly for all hubs
+
+**Scorecard updates:**
+
+Phase 10's primary improvement target is the **Customization layer** (currently
+2.5 → target ≥3.0): the manifest amendment workflow (T05, T06) constitutes a
+formal per-hub configuration contract with migration support, which is the
+specific criterion for Customization improvement.
+
+Overall target: ≥3.5 (Strong).
+
+**CLAUDE.md updates:**
+- Move IHUB-WP-0011 to completed list
+- Set active workplan to IHUB-WP-0012 (Phase 11 — Advanced AI Federation)
+- Update "Current state" description
+
+**Commit all changes** and mark workplan `status: done`.