[barelyworkingcode]

Closes #559

A solo --only stack run now removes the Chief of Staff's startup session and the project folder it made; before, a solo run on main left 3 entries (folder, memory/, a .jsonl) in 2 of 2 runs. The startup prompt carries no run token, so the token sweep never matched it; a full run was clean only because later sessions in the same folder carried the token. At the end of a stack run, every session file in the slot's own project folders goes, and a file whose Claude still runs is handed to the existing detached reaper.

Fix attempts: 1 plus two review rounds (round 1 found a blocking sibling-slot match, fixed). Tokens: ~105k dev agent round 1, ~190k across two reviewers.

Ownership rule (deliberate): a folder is the slot's only if its name is the slot's encoded verify-cos or a project dir under its world, and no longer-named sibling slot claims it. While a sibling slot like x1-world exists, x1's own world project folder stays (ambiguous). The README says so. The cleanup refuses unless the stack file sits in a directory named for its slot that holds its marker.json.
Flakes seen on the way, not caused here: #556 (outside-thread), #558 is fixed (#560), a new one for ask-in-other-mode (4 of 4 solo pass, one slow full run).
Theoretical, not changed: verify-skills could hold a solo session without the token; a world project named like a sibling slot's folder.

Review: round 2 fresh default-model reviewer, no blocking findings; two minors fixed in the last commit
Red on main: solo run on origin/main left 3 entries in the slot's project folder (2 of 2); the selftest sibling-slot cases fail without the rivals rule
Real-app check: solo run left 3 entries on main, 0 on the branch (3 of 3); a solo run beside a hand-made sibling slot left the sibling's dummy sessions untouched
Journey: full --stack run 41/0/0 on the head, nothing left in ~/.claude/projects for the slot
Harness weakening: none, no journey, assertion or timeout changed; the cleanup runs in a finally and cannot change a PASS
Main harness vs head: not applicable, no PASS decision changed
Break-and-restore: with the new cleanup call disabled the solo run left 3 entries again; with the rivals rule removed a selftest case goes red
Verified: 8f82e83 · repo-suite: selftest 18 cases ok, check:static ok, eslint 0 errors; playwright 732 passed on an earlier head (the product code is unchanged) · devboxverify: --stack full 41 pass 0 fail 0 blocked · real-app: solo and full runs leave 0 · log: /tmp/e559

🤖 Generated with Claude Code

[barelyworkingcode]

merge-check: approved, target, verified, contract, evidence, owner, weakening pass; ci NA.