Merge origin/master into PR #219 review branch

Bring PR #219 onto current master before re-evaluating review findings so fixes are tested against the code that would actually land.

Resolve generated catalogs by regeneration, preserve the new ACP tool-schema sidecar format while refreshing affected snapshots keylessly, and update the newly paired Chinese adding-a-tool document to match the background-task guidance. This keeps generated and bilingual artifacts authoritative instead of choosing one conflict side blindly.

tsconfig.json

@@ -32,6 +32,7 @@
     { "path": "./packages/session-query/session-query" },
     { "path": "./packages/core/system-prompt" },
     { "path": "./packages/core/agent" },
+    { "path": "./packages/context/time-context" },
     { "path": "./packages/ui/user-interaction" },
     { "path": "./packages/ui/user-approval" },
     { "path": "./packages/ui/permission" },