chore(pstack): land card worktree commits and hold commits no ref reaches

[zbeyens]

Why

A card session that committed in its own worktree lost that work at landing: the patch was git diff --cached HEAD, which leaves out every commit. And the cleanup scan never checked whether a worktree's commits sat on any branch, so it could delete a worktree holding the only copy of a commit made on a detached HEAD.

What changed

Synced from udecode/dotai@e23bf33, which carries ecaca2a and c13b58f:

• Landing. A card session may commit in its worktree. It lands everything since git merge-base HEAD <checkout branch>, so the patch carries its commits, uncommitted edits and new files.
• Cleanup. The scan, --landed and --remove hold a worktree whose HEAD or HEAD history keeps a commit that no branch, tag or remote reaches, and print the git branch <name> <sha> that saves it.
• The cleanup skill also saves a removal patch only for changes the checkout lacks.

Verification

• An end-to-end run in a scratch repository committed in a worktree, left more work uncommitted, moved the checkout's branch, then landed one merge-base patch: the checkout got the committed change, the uncommitted change and the new file, and scan.mjs --landed passed. The old HEAD-based patch carried none of the commit.
• dotai's cleanup suite passes 25 tests; its new test fails on the old scan. The sync-pstack suite passes 290.
• pnpm check:workflow passes here.

Shipped fast, no review.

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Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-10-16T23:40:16.501675Z	559ef1d	PR opened

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