Merge remote-tracking branch 'origin/master' into codex/basic-session-search

# Conflicts:
#	apps/web/tests/snapshots/question-composer/answered.expected.md
#	packages/client/connection/tests/fake-api.ts
#	packages/client/runtime/README.i18n.yaml
#	packages/client/runtime/tests/fake-api.ts
#	packages/client/ui-workspace/README.i18n.yaml
#	packages/client/ui-workspace/README.md
#	packages/client/ui-workspace/README.zh.md
#	packages/client/ui-workspace/src/client/WorkspaceBrowser.tsx
#	packages/client/ui-workspace/tests/apply.spec.ts
#	packages/host/apiproxy/README.i18n.yaml
#	packages/host/apiproxy/README.md
#	packages/host/apiproxy/README.zh.md
#	packages/host/apiproxy/src/api-proxy.ts
#	packages/host/apiproxy/src/api/index.ts
#	packages/host/apiproxy/src/api/sessions.schema.ts
#	packages/host/apiproxy/src/fetch/client.ts
#	packages/host/apiproxy/src/fetch/handler.ts
#	packages/host/apiproxy/tests/fetch-carrier.spec.ts
#	packages/host/apiproxy/tests/rpc-schemas.spec.ts
#	packages/session-query/session-query/tests/search-helpers.spec.ts

packages/client/ui-workspace/README.md

@@ -2,11 +2,11 @@
 
 English | [中文](README.zh.md)
 
-Shared Workspace browser and picker plugin. `WorkspaceBrowser` fills the sidebar's `sidebar.workspaces` slot, while `WorkspacePicker` fills the page-local Session Intent hero's `conversation.hero.workspace` slot; both surfaces use the same Workspace menu and creation modals.
+Shared Workspace browser and picker plugin. `WorkspaceBrowser` fills the sidebar's `sidebar.workspaces` slot, while `WorkspacePicker` fills the page-local Session Intent hero's `conversation.hero.workspace` slot; both surfaces use the same Workspace menu and creation flow.
 
 The browser renders grouped or flat Session rows from the global runtime hooks and owns the Workspace create/rename and in-Workspace reorder flows. A non-blank search query replaces either browsing mode with one flat result list: case-insensitive title and Workspace substring matches appear immediately, while a 250 ms debounced Host request adds ranked current-conversation content matches and snippets. The English search input and its defensive request path remove NUL, cap the query at the wire schema's 500 UTF-16 code units without splitting a surrogate pair, and preserve the existing debounce and cancellation behavior. Each new query aborts the preceding request; a failed content search leaves metadata matches visible with a warning. The list is capped at 20, asks the user to narrow broader queries, and opens the selected Session without clearing the query or jumping to a specific event.
 
-The picker lists real Host Workspace entities through the global `useWorkspaces` hook. Selecting a Workspace invokes the slot owner's `onPick` callback to retarget the frontend Session object; the existing-folder and create-new actions first create a real Workspace through the object layer, then select it. Create-new disables names already present in that list, while the Host remains authoritative for concurrent or non-UI callers. The runtime Session and Workspace services own materialization. The Workspace row's Delete action opens a confirmation that states the retention boundary, blocks duplicate submission, and keeps failures open; success removes the group while its Sessions remain under Ungrouped.
+The picker lists real Host Workspace entities through the global `useWorkspaces` hook. Selecting a Workspace invokes the slot owner's `onPick` callback to retarget the frontend Session object. The flat **Open local folder...** action delegates to the Host's native single-directory picker, adopts a returned path through the object layer, and selects the committed Workspace only after its list projection has refreshed; cancellation is silent, and errors remain retryable. **Create a new workspace** retains the name dialog and disables names already present in that list, while the Host remains authoritative for concurrent or non-UI callers. The runtime Session and Workspace services own materialization. The Workspace row's Delete action opens a confirmation that states the retention boundary, blocks duplicate submission, and keeps failures open; success removes the group while its Sessions remain under Ungrouped.
 
 Both target slots are declared by other plugins, so `apply` registers through declaration-aware deferral and re-registers after a declaring slot is restored.
 
@@ -22,4 +22,4 @@ None; this package neither assembles nor sends a provider request.
 
 - **No fuzzy content search or event deep links** — the content backend uses literal token/phrase matching, and selecting a result opens the Session rather than the matching event.
 - **No Session deletion control** — the existing Session menu row remains visual-only; Workspace registration deletion does not delete Sessions.
-- **Existing-folder entry is manual path input only** — Host creation failures are shown in the modal.
+- **Native folder selection depends on the local Host carrier** — fixture-only or remote browser deployments cannot open a local operating-system dialog; platform failures are shown in a retryable modal.