fix frontend tests: remove gutted chat/model/channel tests

Delete 4 stale test files:
- channel-contracts.test.js (channel API contracts)
- model-processing.test.js (model catalog transforms)
- user-journey-models.test.js (provider/model E2E)
- api-contracts.test.js (model/persona API contracts)

Update policy-gating.test.js:
- Replace chat surface template assertions with admin surface checks
- Remove settings BYOK/persona policy gating checks (features removed)

Remaining 4 frontend test files all pass (16 tests).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/js/__tests__/policy-gating.test.js

@@ -129,16 +129,16 @@ describe('Team member dropdown population', () => {
     });
 });
 
-// ── Chat surface template ────────────────────
-// v0.37.10: Chat surface is now Preact-rendered. Verify the mount
-// point exists and the old SPA scaffold is gone.
+// ── Kernel surface template ──────────────────
+// v0.1.0: Chat surface removed. Verify admin mount exists and
+// old SPA scaffold is gone.
 
-describe('Chat surface template (v0.37.10)', () => {
+describe('Kernel surface templates (v0.1.0)', () => {
     const templateSrc = readAllTemplates();
 
-    it('chat-mount div exists', () => {
-        assert.ok(templateSrc.includes('id="chat-mount"'),
-            'MISSING: #chat-mount — Preact chat surface cannot render');
+    it('admin-mount div exists', () => {
+        assert.ok(templateSrc.includes('id="admin-mount"'),
+            'MISSING: #admin-mount — Preact admin surface cannot render');
     });
 
     it('old appContainer div is gone', () => {
@@ -146,43 +146,9 @@ describe('Chat surface template (v0.37.10)', () => {
             'STALE: #appContainer still in templates — old SPA scaffold not removed');
     });
 
-    it('chat template loads Preact surface module', () => {
-        assert.ok(templateSrc.includes('sw/surfaces/chat/index.js'),
-            'MISSING: chat surface module import in template');
-    });
-
-    it('chat template loads SDK boot', () => {
+    it('admin template loads SDK boot', () => {
         assert.ok(templateSrc.includes('sw/sdk/index.js'),
-            'MISSING: SDK boot import in chat template');
-    });
-});
-
-// ── Preact surface policy gating ─────────────
-// v0.37.5: Settings surface elements are now rendered by Preact
-// components. Verify the components handle policy gating.
-
-describe('Settings Preact surface handles policy gating', () => {
-    const SURFACES = path.join(SRC, 'sw', 'surfaces', 'settings');
-    const indexSrc = fs.readFileSync(path.join(SURFACES, 'index.js'), 'utf-8');
-
-    it('settings index checks allow_user_byok policy', () => {
-        assert.ok(indexSrc.includes('allow_user_byok'),
-            'MISSING: allow_user_byok check — BYOK nav items will show when disabled');
-    });
-
-    it('settings index checks allow_user_personas policy', () => {
-        assert.ok(indexSrc.includes('allow_user_personas'),
-            'MISSING: allow_user_personas check — Personas nav will show when disabled');
-    });
-
-    it('settings index has byokEnabled state', () => {
-        assert.ok(indexSrc.includes('byokEnabled'),
-            'MISSING: byokEnabled state — BYOK section gating broken');
-    });
-
-    it('settings index has personasEnabled state', () => {
-        assert.ok(indexSrc.includes('personasEnabled'),
-            'MISSING: personasEnabled state — Personas section gating broken');
+            'MISSING: SDK boot import in admin template');
     });
 });