Merge remote-tracking branch 'origin/master' into worktree/web-multimodal-image-input

# Conflicts:
#	apps/cli/src/web.ts
#	apps/web/tests/smoke-fixture.e2e.ts
#	docs/architecture.i18n.yaml
#	packages/client/connection/src/client/fixture.ts
#	packages/client/runtime/src/client/sessions/conversation.ts
#	packages/client/runtime/src/client/sessions/session.ts
#	packages/client/ui-conversation/package.json
#	packages/client/ui-conversation/src/client/contract/slots.ts
#	packages/client/ui-conversation/src/client/index.ts
#	packages/client/ui-conversation/src/client/service.ts
#	packages/client/ui-conversation/src/client/skeleton/ConversationRoot.tsx
#	packages/client/ui-conversation/tests/apply-inject.spec.tsx
#	packages/client/ui-conversation/tests/service-orchestration.spec.ts
#	packages/host/runtime/src/api-proxy.ts
#	packages/host/runtime/src/boot.ts
#	packages/host/webserver/tests/webserver.spec.ts
#	pnpm-lock.yaml

packages/llm/llm-deepseek/tests/adapter.spec.ts

@@ -571,6 +571,27 @@ describe('plugin registration and config', () => {
       .resolves.toBeUndefined()
   })
 
+  it('uses exact model capacity before the adapter-wide default', async () => {
+    const ctx = new Context()
+    await ctx.plugin(LlmService)
+    await ctx.plugin(LlmDeepSeek, {
+      apiKey: 'k',
+      baseURL: 'http://127.0.0.1:1',
+      defaultContextWindow: 256_000,
+      models: [
+        { id: 'inherits-default' },
+        { id: 'exact-override', contextWindow: 64_000 },
+      ],
+    })
+
+    await expect(ctx.llm.resolveModelContext('deepseek', 'inherits-default'))
+      .resolves.toEqual({ contextWindow: 256_000 })
+    await expect(ctx.llm.resolveModelContext('deepseek', 'exact-override'))
+      .resolves.toEqual({ contextWindow: 64_000 })
+    await expect(ctx.llm.resolveModelContext('deepseek', 'unlisted-pass-through'))
+      .resolves.toEqual({ contextWindow: 256_000 })
+  })
+
   it('allows an explicit empty model catalog', async () => {
     const ctx = new Context()
     await ctx.plugin(LlmService)
@@ -612,6 +633,26 @@ describe('plugin registration and config', () => {
     expect(ctx.llm.listProviders()).toEqual([])
   })
 
+  it.each([0, 1.5])(
+    'rejects invalid adapter-wide default context capacity %s',
+    async (defaultContextWindow) => {
+      expect(() => new DeepSeekAdapter({
+        apiKey: 'k',
+        baseURL: 'http://127.0.0.1:1',
+        defaultContextWindow,
+      })).toThrow(/defaultContextWindow must be a positive integer/)
+
+      const ctx = new Context()
+      await ctx.plugin(LlmService)
+      await expect(ctx.plugin(LlmDeepSeek, {
+        apiKey: 'k',
+        baseURL: 'http://127.0.0.1:1',
+        defaultContextWindow,
+      })).rejects.toThrow(/defaultContextWindow/)
+      expect(ctx.llm.listProviders()).toEqual([])
+    },
+  )
+
   it('falls back to DEEPSEEK_API_KEY and DEEPSEEK_BASE_URL env vars', async () => {
     vi.stubEnv('DEEPSEEK_API_KEY', 'env-key')
     vi.stubEnv('DEEPSEEK_BASE_URL', 'http://127.0.0.1:1')

packages/llm/llm-deepseek/tests/serialize.spec.ts

@@ -194,6 +194,15 @@ describe('serializeRequest', () => {
     expect(wire.reasoning_effort).toBe('max')
   })
 
+  it('disables thinking for session-title requests without changing adapter defaults', () => {
+    const wire = serializeRequest(
+      request({ messages: history, purpose: 'session-title' }),
+      { thinking: 'enabled', reasoningEffort: 'max' },
+    )
+    expect(wire.thinking).toEqual({ type: 'disabled' })
+    expect(wire.reasoning_effort).toBeUndefined()
+  })
+
   it('omits thinking fields when unset (provider default applies)', () => {
     const wire = serializeRequest(request({ messages: history }))
     expect(wire.thinking).toBeUndefined()