Tasks gain kind='main'|'side' (NULL=main). A side thread hangs under a
parent task, defaults to the local executor, never builds a worktree,
branch or container unless explicitly asked, and writes its conclusion
back to the parent via task_followups on terminal transition.
- server: kind validation + side-thread gates (parent required, no
coordinator_parts/upload_id/environment_id, parent must not be a
coordinator), local executor default, GET /tasks kind filter,
/worktree 404 and /fork /merge /pr 409 for side threads.
- worker: side-default shunt in _run_attempt (no-worktree scratch cwd,
in-memory plan=1 when a repo is present, seed/checkpoint skipped),
_writeback_side_thread, marker task-create kind field + inheritance,
side threads excluded from marker spawn counts.
- host/sandbox: --no-worktree plumbing for dispatch/goal/popen
(Local + Docker), scratch cwd work/side-threads/<task-id>.
- console (classic only): kind filter + [旁聊] rows + '开旁聊' entry,
side-thread dispatch mode, side-thread list in detail, merge/PR/fork
hidden for side threads; build exit 0, console.html sha df39db5a.
- tests: new test_sidethread.py (29 tests) + kind backfill tests in
test_p2_migrations.py; full cloud suite 3900 tests OK (skipped=13).
Design: verification/codex-muse-role-alignment-design-20261108.md
Summary: verification/codex-muse-role-align-p1p2-20261108.md
Local only: not pushed, not merged, not deployed.
host