Merge branch 'worktree/web-carrier-chain' into worktree/web-ask-user-question

Restack the ask-user domain layer onto the carrier-chain architecture
branch. Conflict policy: runtime and ui-conversation take the
carrier-chain side (master sessions shape, dual-kind PendingCard,
'internal' envelope shell tests); the 'cancelled' wire code and its
semantics tests stay in apiproxy + ui-question (domain layer); the
smoke fixture keeps the nine-bundle success pass with the resident
question round over the carrier-chain first-describe shape.

scripts/gen-cordis-catalog.ts

@@ -198,6 +198,8 @@ const TYPE_LINK_EXEMPTIONS: Readonly<Record<string, string>> = {
   LocaleDict: 'service-local dictionary shape is owned by packages/client/i18n/src/index.ts',
   ThemeTokens: 'service-local token dictionary is owned by packages/client/ui-theme/src/index.ts',
   Translate: 'service-local bound translator is owned by packages/client/i18n/src/index.ts',
+  TuiOverlayRequest: 'service-local extension contract is owned by packages/ui/tui/README.md',
+  TuiOverlaySession: 'service-local extension contract is owned by packages/ui/tui/README.md',
   InvariantRegistration: 'service-local lifecycle handle is owned by packages/support/invariants/README.md',
   PresetOption: 'deployment menu metadata is owned by packages/ui/permission/README.md',
   PresetSpec: 'deployment preset composition is owned by packages/ui/permission/README.md',

scripts/gen-doc-graphs.ts

@@ -197,6 +197,13 @@ const SERVICE_ROLES: ServiceRole[] = [
     consumers: ['tui', 'acp'],
     note: 'Plugins register direct human commands; TUI and ACP consume the same effective per-agent catalog without sending invocations to the model.',
   },
+  {
+    key: 'tui',
+    pkg: 'tui',
+    title: 'Mounted-terminal interaction service',
+    mode: 'bundle',
+    note: 'One TUI front door provides a FIFO overlay host; injected plugins receive caller-fiber ownership without access to pi-tui or terminal lifecycle state.',
+  },
   {
     key: 'skills',
     pkg: 'skill',