fix(finishing): don't cleanup worktree when creating PR

[chris-yyau]

What problem are you trying to solve?

Step 5 "Cleanup Worktree" in finishing-a-development-branch/SKILL.md lists Options 1, 2, 4 for worktree cleanup. But three other sections in the same document disagree:

• Quick Reference table (line 157): Option 2 shows "Keep Worktree: ✓"
• Common Mistakes (line 173): "Only cleanup for Options 1 and 4"
• Red Flags (line 191): "Clean up worktree for Options 1 & 4 only"

When a user picks Option 2 (Create PR), the agent cleans up the worktree — but the user may still need it while the PR is under review. This contradicts the document's own guidance.

What does this PR change?

Updates Step 5 to cleanup worktree for Options 1 and 4 only, matching the Quick Reference table, Common Mistakes, and Red Flags sections.

Is this change appropriate for the core library?

Yes — this fixes an internal contradiction in a core skill document. The finishing skill is general-purpose infrastructure used by all users.

What alternatives did you consider?

1. Update the other three sections to include Option 2 — Rejected because cleaning up a worktree while a PR is under review removes the user's ability to iterate on review feedback.
2. Add a conditional note — Rejected as over-engineering. The document already established the right behavior in 3 out of 4 places; simplest fix is aligning the outlier.

Does this PR contain multiple unrelated changes?

No. Single line change fixing one contradiction.

Existing PRs

• I have reviewed all open AND closed PRs for duplicates or prior art
• Related PRs: none found

Environment tested

Harness	Harness version	Model	Model version/ID
Claude Code	1.0.33	Claude	claude-opus-4-20250514

Evaluation

• Initial prompt: "Check for internal contradictions in superpowers skill documents"
• Verified by reading the full finishing skill document and confirming all four sections now agree on cleanup behavior (Options 1 and 4 only).
• Single documentation fix — behavioral eval not applicable.

Rigor

• If this is a skills change: I used superpowers:writing-skills and completed adversarial pressure testing (paste results below)
• This change was tested adversarially, not just on the happy path
• I did not modify carefully-tuned content (Red Flags table, rationalizations, "human partner" language) without extensive evals showing the change is an improvement

This change aligns Step 5 with the existing Red Flags and Common Mistakes tables — it does not modify their content.

Human review

• A human has reviewed the COMPLETE proposed diff before submission

[Copilot]

Pull request overview

This PR updates the finishing-a-development-branch skill documentation to ensure worktree cleanup guidance matches the intended workflow—specifically that creating a PR should preserve the worktree while it’s under review.

Changes:

• Updated Step 5 “Cleanup Worktree” to specify cleanup applies to Options 1 and 4 (not Option 2).

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[Copilot]

Step 5 now says cleanup is only for Options 1 and 4, but Option 2 still ends with “Then: Cleanup worktree (Step 5)”. With this change, following Option 2’s flow leads to a contradictory instruction. Consider updating Step 4’s Option 2 section to not direct users to Step 5, or add an explicit “For Option 2: keep worktree” note in Step 5 to remove ambiguity.