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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.