Merge remote-tracking branch 'origin/master' into worktree/web-session-model-selector

# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-15-llm-model-catalog-and-acp-selection.i18n.yaml
#	.agents/notes/implemented/architecture/2026-07-23-client-plugin-loading-model.i18n.yaml
#	apps/cli/src/web.ts
#	apps/web/tests/session-title.snapshot.ts
#	apps/web/tests/smoke-fixture.e2e.ts
#	packages/client/connection/src/client/api.ts
#	packages/client/connection/src/client/fixture.ts
#	packages/client/connection/src/client/index.ts
#	packages/client/runtime/src/client/index.ts
#	packages/client/runtime/src/client/sessions/conversation.ts
#	packages/client/runtime/src/client/sessions/session.ts
#	packages/client/runtime/tests/fake-api.ts
#	packages/client/ui-conversation/src/client/contract/slots.ts
#	packages/client/ui-conversation/src/client/index.ts
#	packages/client/ui-conversation/src/client/skeleton/ConversationRoot.tsx
#	packages/client/ui-conversation/src/client/skeleton/InputBar.module.css
#	packages/client/ui-conversation/src/client/skeleton/InputBar.tsx
#	packages/client/ui-conversation/tests/chat-stats-bash-sample.spec.tsx
#	packages/client/ui-conversation/tests/chat-toolview-slot.spec.tsx
#	packages/client/ui-conversation/tests/chat-view.spec.tsx
#	packages/client/ui-conversation/tests/gate-branch-tails.spec.tsx
#	packages/client/ui-conversation/tests/skeleton-branches.spec.tsx
#	packages/client/ui-conversation/tests/skeleton.spec.tsx
#	packages/host/apiproxy/README.md
#	packages/host/apiproxy/src/api-proxy.ts
#	packages/host/apiproxy/src/api/rpc.schema.ts
#	packages/host/apiproxy/src/api/rpc.ts
#	packages/host/apiproxy/tests/api-proxy-models.spec.ts
#	packages/host/apiproxy/tests/rpc-schemas.spec.ts
#	packages/host/runtime/README.md
#	packages/llm/llm-deepseek/README.md
#	scripts/translation-pairing.manifest.json
#	tsconfig.client.json

vitest.config.ts

@@ -11,6 +11,7 @@ const windowsUnsupportedPackages = process.platform === 'win32'
   ? [
       'packages/bash/*',
       'packages/hooks/*',
+      'packages/pty/pty-local',
       'packages/sandbox/sandbox-local',
       'packages/sdk/create-sdk',
       'packages/sdk/helper',
@@ -30,6 +31,7 @@ const windowsCoverageExclusions = process.platform === 'win32'
 
 const testIncludes = [
   'packages/*/*/tests/**/*.spec.{ts,tsx}',
+  'apps/*/tests/**/*.spec.ts',
   'examples/*/tests/**/*.spec.ts',
   'scripts/**/*.spec.ts',
 ]
@@ -59,7 +61,10 @@ export default defineConfig({
         plugins: [pathsPlugin()],
         test: {
           name: 'thread-safe',
-          pool: 'threads',
+          // Node 24 has aborted in its CJS lexer from a macOS arm64 worker
+          // thread. A fork contains that external runtime failure to the test
+          // process; other hosts retain the lower-overhead thread pool.
+          pool: process.platform === 'darwin' ? 'forks' : 'threads',
           setupFiles: ['./scripts/test-invariants.ts'],
           include: testIncludes,
           exclude: [
@@ -105,8 +110,22 @@ export default defineConfig({
         'packages/client/ui-layout/src/*',
         'packages/client/web/src/*',
         'packages/host/webserver/src/*',
-        'packages/client/modules/src/loader.ts',
+        'packages/client/modules/src/client/system.ts',
         'packages/client/hmr/src/client/index.ts',
+        // Web config-tree boot round: the new host-side web-transport halves
+        // whose remaining branches need real-composition/process harnesses.
+        // TODO(gui): cover and remove with the client test lane above.
+        'packages/client/modules/src/index.ts',
+        'packages/client/modules/src/invariant.ts',
+        'packages/client/modules/src/client/index.ts',
+        'packages/client/modules/src/client/manifest.ts',
+        'packages/client/hmr/src/index.ts',
+        'packages/client/hmr/src/invariant.ts',
+        'packages/client/connection/src/index.ts',
+        'packages/client/connection/src/http-bridge.ts',
+        'packages/host/apiproxy/src/index.ts',
+        'packages/host/apiproxy/src/invariant.ts',
+        'packages/host/apiproxy/src/api-proxy.ts',
         ...windowsUnsupportedPackages.map(path => `${path}/src/**/*.ts`),
         ...windowsCoverageExclusions,
       ],