Merge remote-tracking branch 'origin/master' into feat/add-session-data-preview

# Conflicts:
#	docs/core-data-structures/session.i18n.yaml
#	packages/client/ui-conversation/README.i18n.yaml
#	packages/client/ui-conversation/README.md
#	packages/llm/token-meter/README.i18n.yaml
#	packages/llm/token-meter/README.md
#	packages/llm/token-meter/README.zh.md
#	packages/llm/token-meter/src/projection.ts

packages/client/connection/src/client/fixture.ts

@@ -2394,6 +2394,7 @@ export function createFixtureApi(options: FixtureOptions = {}): ApiProxy {
       // editor; real schema-driven forms ride the HTTP transport.
       describe: request => ok(request, {
         writable: true,
+        hasDocument: true,
         namespaces: [{
           ns: 'llm-deepseek',
           schema: {},
@@ -2403,6 +2404,8 @@ export function createFixtureApi(options: FixtureOptions = {}): ApiProxy {
           revision: 0,
         }],
       }),
+      // Native opens are deterministic no-op successes in this fixture, as is host.openPath.
+      openDocument: request => ok(request, { opened: true as const }),
       update: request => err(request, {
         code: 'settings-rejected',
         message: 'fixture: the minimal readiness settings descriptor is read-only',
@@ -2553,6 +2556,7 @@ export class FixtureApiClient extends AbstractApiClient {
       case 'goal.complete': return this.api.goals.complete(request)
       case 'goal.clear': return this.api.goals.clear(request)
       case 'settings.describe': return this.api.settings.describe(request)
+      case 'settings.openDocument': return this.api.settings.openDocument(request, signal)
       case 'settings.update': return this.api.settings.update(request)
       case 'settings.replace': return this.api.settings.replace(request)
       case 'settings.mutate': return this.api.settings.mutate(request)

packages/client/connection/src/index.ts

@@ -53,6 +53,7 @@ const PRIVILEGED_METHODS = new Set([
   'host.pickDirectory',
   'host.openPath',
   'settings.describe',
+  'settings.openDocument',
   'settings.update',
   'settings.replace',
   'settings.mutate',