- Hooks/session-memory: keep `/new` and `/reset` memory artifacts in the bound agent workspace and align saved reset session keys with that workspace when stale main-agent keys leak into the hook path. (#39875) thanks @rbutera.

- Sessions/model switch: clear stale cached `contextTokens` when a session changes models so status and runtime paths recompute against the active model window. (#38044) thanks @yuweuii.

- ACP/session history: persist transcripts for successful ACP child runs, preserve exact transcript text, record ACP spawned-session lineage, and keep spawn-time transcript-path persistence best-effort so history storage failures do not block execution. (#40137) thanks @mbelinky.

- Browser/CDP: normalize loopback direct WebSocket CDP URLs back to HTTP(S) for `/json/*` tab operations so local `ws://` / `wss://` profiles can still list, focus, open, and close tabs after the new direct-WS support lands. (#31085) Thanks @shrey150.

- Context engine registry/bundled builds: share the registry state through a `globalThis` singleton so duplicated bundled module copies can resolve engines registered by each other at runtime, with regression coverage for duplicate-module imports. (#40115) thanks @jalehman.

## 2026.3.7