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Root checkout is a ref store: worktree spawns never touch it

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Worktree spawns now fetch only. The agent's branch is cut from
origin/* and the root checkout - which may hold the operator's own
work - is never fast-forwarded, merged, or re-parked by a spawn. A
failed fetch on a worktree spawn is fatal instead of a silent note:
the contract is 'starts at the remote's latest push', and cutting a
branch from stale refs would break it quietly.

Hardening around the same contract: the branch start falls back
origin/HEAD -> origin/main -> origin/master when the head pin is
missing, and a stale agent/<name> branch left behind by a deleted
agent is reset to the remote tip (-B) instead of silently shadowing
it - while -B's refusal to move a branch checked out elsewhere keeps
in-flight agents protected. Root/subdir placements (schedule firings,
mise-init) keep the fast-forward behavior for their shared tree, as
does the explicit sync command.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01731mKtVzsfeT4Vi3TvkR48
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Claude
2026-08-14 18:54:53 +00:00
parent 2a8cac7895
commit 042e27dd15
5 changed files with 194 additions and 39 deletions
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CHANGELOG.md
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@@ -8,6 +8,20 @@ the image workflows publish (plus `latest` from every push to `main`).
### Fixed
- **The project-root checkout is now a ref store, never a working tree Handler moves.**
Worktree spawns fetch only: the agent's branch is cut from `origin/*` and the root
checkout — which may hold the operator's own work — is never fast-forwarded, merged,
or re-parked. A failed fetch on a worktree spawn is now **fatal** instead of a silent
note (the contract is "starts at the remote's latest push"; cutting from stale refs
would break it quietly). Branch starts fall back `origin/HEAD` → `origin/main` →
`origin/master` when the head pin is missing, and a stale `agent/<name>` branch left
by a deleted agent is reset to the remote tip instead of shadowing it. Root/subdir
placements (schedule firings, mise-init) keep the old fast-forward behavior for
their shared tree. 2 end-to-end regression tests (bare remote, parked root,
out-of-band push).
### Fixed
- **Agents missing freshly pushed commits.** A spawn with no explicit placement ran
the agent in the shared project-root checkout, and the root only fast-forwards
while parked on the default branch — so as soon as one agent left it on a feature