feat(client): close the 9 metadata-family REST gaps (#3587 batch 1/5)

Seven new meta methods, each URL-pinned in client.test.ts:
getDiagnostics (spec-validation sweep), getReferences (reverse refs),
getBookTree (ADR-0046 §6), getAudit (ADR-0010 §3.6 protection trail),
publishItem / rollbackItem / diffItem (ADR-0033 per-item lifecycle).

The two compound-name routes (GET|PUT /meta/:type/:section/:name) were
already expressible — getItem/saveItem pass slashes through unencoded;
the audit note claiming an encoding barrier described deleteItem, not
them. Flipped to sdk with pinning tests locking the pass-through
instead of adding methods.

Ledger: 9 metadata rows gap→sdk; ratchet 43→34. client-sdk.mdx meta
section updated (11→18 methods + examples).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LX9ut3MK3KykE11S9bJmv5

Author: claude

.changeset/close-the-nine-metadata-rest-gaps.md

@@ -0,0 +1,16 @@
+---
+"@objectstack/client": minor
+"@objectstack/rest": patch
+---
+
+feat(client): close the 9 metadata-family REST gaps the #3587 ledger carried (#3587)
+
+New `meta` surface: `getDiagnostics` (spec-validation sweep), `getReferences`
+(reverse references), `getBookTree` (ADR-0046 §6 spine resolution), `getAudit`
+(ADR-0010 §3.6 protection trail), `publishItem` / `rollbackItem` / `diffItem`
+(ADR-0033 per-item draft lifecycle). The two compound-name routes
+(`GET|PUT /meta/:type/:section/:name`) turned out to be already expressible —
+`getItem`/`saveItem` pass slashes through unencoded — so they are flipped to
+`sdk` with URL-pinning tests instead of new methods (the audit note claiming
+an encoding barrier was wrong; only `deleteItem` encodes). REST route-ledger
+ratchet: 43 → 34.

content/docs/api/client-sdk.mdx

@@ -109,7 +109,7 @@ The `@objectstack/client` SDK aims to implement the ObjectStack API protocol spe
 | Namespace | Status | Methods | Purpose |
 |:----------|:------:|:--------|:--------|
 | **discovery** | ✅ | 1 | API version & capabilities detection |
-| **meta** | ✅ | 11 | Metadata read/write, published versions & drafts (ADR-0033), FSM introspection (ADR-0020) |
+| **meta** | ✅ | 18 | Metadata read/write, published versions & drafts (ADR-0033), per-item publish/rollback/diff, FSM introspection (ADR-0020), diagnostics, references, audit trail, book trees (ADR-0046) |
 | **data** | ✅ | 10 | CRUD & query operations |
 | **auth** | ✅ | 5 | Authentication & user management |
 | **packages** | ✅ | 17 | Package lifecycle: install/enable, drafts (ADR-0033), commits & rollback (ADR-0067), export/duplicate (ADR-0070) |
@@ -163,6 +163,20 @@ if (cached.notModified) {
 
 // Get auto-generated view
 const listView = await client.meta.getView('account', 'list');
+
+// Compound names (sub-resources) pass through unencoded
+const view = await client.meta.getItem('object', 'views/all_leads');
+
+// Per-item draft lifecycle (ADR-0033)
+await client.meta.publishItem('object', 'account', { message: 'go live' });
+await client.meta.rollbackItem('object', 'account', 3);
+const diff = await client.meta.diffItem('object', 'account', { from: 2, to: 5 });
+
+// Introspection & governance
+const bad = await client.meta.getDiagnostics({ severity: 'error' });
+const refs = await client.meta.getReferences('object', 'account');
+const trail = await client.meta.getAudit('object', 'account', { limit: 20 });
+const tree = await client.meta.getBookTree('handbook');
 ```
 
 ### `client.data` — CRUD & Batch

packages/client/src/client.test.ts

@@ -119,6 +119,83 @@ describe('ObjectStackClient', () => {
             'http://localhost:3000/api/v1/ui/view/customer/form',
         );
     });
+
+    it('meta.getDiagnostics pins GET /meta/diagnostics with its query params', async () => {
+        const { client, fetchMock } = createMockClient({ success: true, data: { items: [] } });
+        await client.meta.getDiagnostics();
+        expect(String(fetchMock.mock.calls[0][0])).toBe(
+            'http://localhost:3000/api/v1/meta/diagnostics',
+        );
+        await client.meta.getDiagnostics({ type: 'object', severity: 'warning', packageId: 'com.example.crm' });
+        expect(String(fetchMock.mock.calls[1][0])).toBe(
+            'http://localhost:3000/api/v1/meta/diagnostics?type=object&severity=warning&package=com.example.crm',
+        );
+    });
+
+    it('meta.getReferences pins GET /meta/:type/:name/references', async () => {
+        const { client, fetchMock } = createMockClient({ success: true, data: { references: [] } });
+        await client.meta.getReferences('object', 'customer');
+        expect(String(fetchMock.mock.calls[0][0])).toBe(
+            'http://localhost:3000/api/v1/meta/object/customer/references',
+        );
+    });
+
+    it('meta.getBookTree pins GET /meta/book/:name/tree', async () => {
+        const { client, fetchMock } = createMockClient({ success: true, data: { tree: [] } });
+        await client.meta.getBookTree('handbook', { packageId: 'com.example.docs' });
+        expect(String(fetchMock.mock.calls[0][0])).toBe(
+            'http://localhost:3000/api/v1/meta/book/handbook/tree?package=com.example.docs',
+        );
+    });
+
+    it('meta.getAudit pins GET /meta/:type/:name/audit', async () => {
+        const { client, fetchMock } = createMockClient({ success: true, data: { events: [] } });
+        await client.meta.getAudit('object', 'customer', { limit: 20 });
+        expect(String(fetchMock.mock.calls[0][0])).toBe(
+            'http://localhost:3000/api/v1/meta/object/customer/audit?limit=20',
+        );
+    });
+
+    it('meta.publishItem pins POST /meta/:type/:name/publish and passes message', async () => {
+        const { client, fetchMock } = createMockClient({ success: true, data: { published: true } });
+        await client.meta.publishItem('object', 'customer', { message: 'go live' });
+        const [url, init] = fetchMock.mock.calls[0];
+        expect(String(url)).toBe('http://localhost:3000/api/v1/meta/object/customer/publish');
+        expect(init.method).toBe('POST');
+        expect(JSON.parse(init.body)).toEqual({ message: 'go live' });
+    });
+
+    it('meta.rollbackItem pins POST /meta/:type/:name/rollback with toVersion', async () => {
+        const { client, fetchMock } = createMockClient({ success: true, data: { restored: true } });
+        await client.meta.rollbackItem('object', 'customer', 3);
+        const [url, init] = fetchMock.mock.calls[0];
+        expect(String(url)).toBe('http://localhost:3000/api/v1/meta/object/customer/rollback');
+        expect(init.method).toBe('POST');
+        expect(JSON.parse(init.body)).toEqual({ toVersion: 3 });
+    });
+
+    it('meta.diffItem pins GET /meta/:type/:name/diff with from/to', async () => {
+        const { client, fetchMock } = createMockClient({ success: true, data: { changes: [] } });
+        await client.meta.diffItem('object', 'customer', { from: 2, to: 5 });
+        expect(String(fetchMock.mock.calls[0][0])).toBe(
+            'http://localhost:3000/api/v1/meta/object/customer/diff?from=2&to=5',
+        );
+    });
+
+    it('meta.getItem/saveItem pass compound names through unencoded (reaches /meta/:type/:section/:name)', async () => {
+        const { client, fetchMock } = createMockClient({ success: true, data: { name: 'views/all_leads' } });
+        await client.meta.getItem('object', 'views/all_leads');
+        // The slash must survive: %2F would collapse the request onto the
+        // 3-segment /meta/:type/:name route and miss the compound handler.
+        expect(String(fetchMock.mock.calls[0][0])).toBe(
+            'http://localhost:3000/api/v1/meta/object/views/all_leads',
+        );
+        await client.meta.saveItem('object', 'views/all_leads', { label: 'All leads' });
+        expect(String(fetchMock.mock.calls[1][0])).toBe(
+            'http://localhost:3000/api/v1/meta/object/views/all_leads',
+        );
+        expect(fetchMock.mock.calls[1][1].method).toBe('PUT');
+    });
 });
 
 describe('Approvals namespace (ADR-0019)', () => {

packages/client/src/index.ts

@@ -546,6 +546,96 @@ export class ObjectStackClient {
             `${this.baseUrl}${route}/objects/${encodeURIComponent(object)}/state/${encodeURIComponent(field)}${qs}`,
         );
         return this.unwrapResponse<{ object: string; field: string; from: string | null; next: string[] | null }>(res);
+    },
+
+    /**
+     * Cross-type spec-validation sweep: every metadata entry that fails its
+     * registered Zod schema. Powers governance dashboards and doctor-style
+     * checks. 501s on kernels without `getMetaDiagnostics`.
+     */
+    getDiagnostics: async (opts?: { type?: string; severity?: 'error' | 'warning'; packageId?: string }) => {
+        const route = this.getRoute('metadata');
+        const params = new URLSearchParams();
+        if (opts?.type) params.set('type', opts.type);
+        if (opts?.severity) params.set('severity', opts.severity);
+        if (opts?.packageId) params.set('package', opts.packageId);
+        const qs = params.toString();
+        const res = await this.fetch(`${this.baseUrl}${route}/diagnostics${qs ? `?${qs}` : ''}`);
+        return this.unwrapResponse<any>(res);
+    },
+
+    /**
+     * Reverse references: metadata items that reference `type`/`name`.
+     * `{ references: [] }` on kernels without reference tracking.
+     */
+    getReferences: async (type: string, name: string) => {
+        const route = this.getRoute('metadata');
+        const res = await this.fetch(`${this.baseUrl}${route}/${type}/${name}/references`);
+        return this.unwrapResponse<any>(res);
+    },
+
+    /**
+     * ADR-0046 §6: resolve a book spine against the docs that exist now.
+     * An unknown name is treated as a package id (implicit per-package book).
+     */
+    getBookTree: async (name: string, opts?: { packageId?: string }) => {
+        const route = this.getRoute('metadata');
+        const qs = opts?.packageId ? `?package=${encodeURIComponent(opts.packageId)}` : '';
+        const res = await this.fetch(`${this.baseUrl}${route}/book/${encodeURIComponent(name)}/tree${qs}`);
+        return this.unwrapResponse<any>(res);
+    },
+
+    /**
+     * ADR-0010 §3.6 protection-audit trail for a metadata item: recent
+     * save/publish/rollback/delete/reset attempts, allowed and denied.
+     * `{ events: [] }` where the audit table is not provisioned.
+     */
+    getAudit: async (type: string, name: string, opts?: { limit?: number }) => {
+        const route = this.getRoute('metadata');
+        const qs = opts?.limit !== undefined ? `?limit=${opts.limit}` : '';
+        const res = await this.fetch(`${this.baseUrl}${route}/${type}/${name}/audit${qs}`);
+        return this.unwrapResponse<any>(res);
+    },
+
+    /**
+     * ADR-0033: promote a single item's pending draft overlay to live —
+     * the per-item flow beside `packages.publishDrafts`' package-scoped one.
+     * 404 [no_draft] when there is nothing to publish. Compound names pass
+     * through unencoded, like `getItem`.
+     */
+    publishItem: async (type: string, name: string, opts?: { message?: string }) => {
+        const route = this.getRoute('metadata');
+        const res = await this.fetch(`${this.baseUrl}${route}/${type}/${name}/publish`, {
+            method: 'POST',
+            body: JSON.stringify(opts?.message ? { message: opts.message } : {}),
+        });
+        return this.unwrapResponse<any>(res);
+    },
+
+    /**
+     * Restore the body at history version `toVersion` as the new live row.
+     */
+    rollbackItem: async (type: string, name: string, toVersion: number, opts?: { message?: string }) => {
+        const route = this.getRoute('metadata');
+        const res = await this.fetch(`${this.baseUrl}${route}/${type}/${name}/rollback`, {
+            method: 'POST',
+            body: JSON.stringify({ toVersion, ...(opts?.message ? { message: opts.message } : {}) }),
+        });
+        return this.unwrapResponse<any>(res);
+    },
+
+    /**
+     * Structural diff between two history versions (`from`/`to`); omit both
+     * for previous-vs-current.
+     */
+    diffItem: async (type: string, name: string, opts?: { from?: number; to?: number }) => {
+        const route = this.getRoute('metadata');
+        const params = new URLSearchParams();
+        if (opts?.from !== undefined) params.set('from', String(opts.from));
+        if (opts?.to !== undefined) params.set('to', String(opts.to));
+        const qs = params.toString();
+        const res = await this.fetch(`${this.baseUrl}${route}/${type}/${name}/diff${qs ? `?${qs}` : ''}`);
+        return this.unwrapResponse<any>(res);
     }
   };
 

packages/rest/src/rest-route-ledger.conformance.test.ts

@@ -144,12 +144,13 @@ describe('REST route ledger hygiene', () => {
   });
 
   it('gap count only shrinks — update the ledger (and this number) when closing gaps', () => {
-    // Ratchet, not aspiration: 43 audited gaps at #3587 PR-1 (metadata 9,
-    // data-actions 2, search 1, email 1, analytics 1, security-explain 2,
-    // record-shares 3, sharing-rules 5, reports 8, approvals 6,
-    // external-datasource 5). Closing a gap = reclassify to `sdk` AND lower
-    // this bound. Raising it demands an explicit, reviewed decision.
+    // Ratchet, not aspiration: 43 audited gaps at #3587 PR-1; 34 after the
+    // metadata batch closed its 9 (data-actions 2, search 1, email 1,
+    // analytics 1, security-explain 2, record-shares 3, sharing-rules 5,
+    // reports 8, approvals 6, external-datasource 5 remain). Closing a gap =
+    // reclassify to `sdk` AND lower this bound. Raising it demands an
+    // explicit, reviewed decision.
     const gaps = REST_ROUTE_LEDGER.filter((e) => e.disposition === 'gap').length;
-    expect(gaps).toBeLessThanOrEqual(43);
+    expect(gaps).toBeLessThanOrEqual(34);
   });
 });

packages/rest/src/rest-route-ledger.ts

@@ -80,32 +80,26 @@ export const REST_ROUTE_LEDGER: readonly RestRouteLedgerEntry[] = [
 
   // ── metadata ──────────────────────────────────────────────────────────────
   { route: 'GET /api/v1/meta', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.getTypes' },
-  { route: 'GET /api/v1/meta/diagnostics', family: 'metadata', source: 'route-manager', disposition: 'gap',
-    note: 'spec-validation diagnostics listing — Studio-grade admin data with no SDK expression' },
+  { route: 'GET /api/v1/meta/diagnostics', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.getDiagnostics' },
   { route: 'GET /api/v1/meta/_drafts', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.listDrafts' },
   { route: 'GET /api/v1/meta/:type', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.getItems' },
-  { route: 'GET /api/v1/meta/:type/:name/references', family: 'metadata', source: 'route-manager', disposition: 'gap',
-    note: 'reverse-reference listing with no SDK expression' },
-  { route: 'GET /api/v1/meta/book/:name/tree', family: 'metadata', source: 'route-manager', disposition: 'gap',
-    note: 'ADR-0046 §6 book-spine resolution with no SDK expression' },
+  { route: 'GET /api/v1/meta/:type/:name/references', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.getReferences' },
+  { route: 'GET /api/v1/meta/book/:name/tree', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.getBookTree' },
   { route: 'GET /api/v1/meta/:type/:name', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.getItem' },
   { route: 'PUT /api/v1/meta/:type/:name', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.saveItem' },
   { route: 'DELETE /api/v1/meta/:type/:name', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.deleteItem',
     note: 'REST-only: the dispatcher /meta branch has no DELETE handling — it falls into the read path' },
   { route: 'GET /api/v1/meta/:type/:name/history', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.getHistory',
     note: 'REST-only: the dispatcher /meta branch swallows /history as a compound name and 404s' },
-  { route: 'GET /api/v1/meta/:type/:name/audit', family: 'metadata', source: 'route-manager', disposition: 'gap',
-    note: 'protection-audit events with no SDK expression' },
-  { route: 'POST /api/v1/meta/:type/:name/publish', family: 'metadata', source: 'route-manager', disposition: 'gap',
-    note: 'per-item draft→active publish (ADR-0033) with no SDK expression; packages.publishDrafts covers only the package-scoped flow' },
-  { route: 'POST /api/v1/meta/:type/:name/rollback', family: 'metadata', source: 'route-manager', disposition: 'gap',
-    note: 'restore-at-history-version with no SDK expression' },
-  { route: 'GET /api/v1/meta/:type/:name/diff', family: 'metadata', source: 'route-manager', disposition: 'gap',
-    note: 'metadata version diff (?from/?to) with no SDK expression' },
-  { route: 'GET /api/v1/meta/:type/:section/:name', family: 'metadata', source: 'route-manager', disposition: 'gap',
-    note: 'compound-name read; meta.getItem URL-encodes the slash so it cannot reach this shape — needs the unencoded pass-through meta.getPublished got in #3579' },
-  { route: 'PUT /api/v1/meta/:type/:section/:name', family: 'metadata', source: 'route-manager', disposition: 'gap',
-    note: 'compound-name save; same encoding barrier as the compound read' },
+  { route: 'GET /api/v1/meta/:type/:name/audit', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.getAudit' },
+  { route: 'POST /api/v1/meta/:type/:name/publish', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.publishItem',
+    note: 'per-item ADR-0033 publish; packages.publishDrafts remains the package-scoped flow' },
+  { route: 'POST /api/v1/meta/:type/:name/rollback', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.rollbackItem' },
+  { route: 'GET /api/v1/meta/:type/:name/diff', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.diffItem' },
+  { route: 'GET /api/v1/meta/:type/:section/:name', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.getItem',
+    note: 'compound names pass through getItem unencoded (URL-pinned in client.test.ts); only deleteItem encodes' },
+  { route: 'PUT /api/v1/meta/:type/:section/:name', family: 'metadata', source: 'route-manager', disposition: 'sdk', client: 'meta.saveItem',
+    note: 'compound names pass through saveItem unencoded (URL-pinned in client.test.ts)' },
 
   // ── ui ────────────────────────────────────────────────────────────────────
   { route: 'GET /api/v1/ui/view/:object/:type', family: 'ui', source: 'route-manager', disposition: 'sdk', client: 'meta.getView',