### Highlights
- ExecPolicy2 integration and exec-server prep: core now integrates ExecPolicy2 with exec-server refactors and cutover groundwork, plus quickstart docs to help teams adopt the new policy engine.
- Improved truncation and error reporting: single-pass truncation reduces duplicate work, and error events can now carry optional status codes for clearer observability.
- Shell reliability and sandbox warnings: fallback shell selection is hardened and world-writable directory warnings are less noisy, including improved messaging on Windows.
- UX fixes: corrected reasoning display, preserved review footer context after `/review`, and the model migration screen now shows only once.
### PRs Merged
- fix(app-server) move windows world writable warning (#6916) — @dylan-hurd-oai
- [core] add optional status_code to error events (#6865) — @celia-oai
- fix: prepare ExecPolicy in exec-server for execpolicy2 cutover (#6888) — @bolinfest
- stop over-reporting world-writable directories (#6936) — @iceweasel-oai
- fix(context left after review): review footer context after `/review` (#5610) — @guidedways
- Fix/correct reasoning display (#6749) — @lionelchg
- chore: refactor exec-server to prepare it for standalone MCP use (#6944) — @bolinfest
- fix(shell) fallback shells (#6948) — @dylan-hurd-oai
- execpolicy2 core integration (#6641) — @zhao-oai
- Single pass truncation (#6914) — @pakrym-oai
- update execpolicy quickstart readme (#6952) — @zhao-oai
- stop model migration screen after first time. (#6954) — @aibrahim-oai