fix(pstack): protect untracked and ignored worktree files

[dajiaohuang]

Summary

• Count tracked, untracked, and ignored worktree paths as held WIP.
• Remove the guidance to force-remove worktrees or delete leftover directories.

Fixes #449.

Validation

• Bash syntax check passed.
• Synthetic Git worktree with one untracked file and one ignored directory reported wip:2 and hold-wip.
• git diff --check passed.

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Note

Medium Risk
Updates the human-gated worktree deletion playbook and audit lever; the changes are conservative but mistakes here could still block cleanup or mis-classify dirty state.

Overview
Worktree cleanup no longer treats untracked or ignored files as disposable “scratch.” The audit script now runs git status with --untracked-files=all and --ignored=matching, and any non-clean worktree is labeled wip:N (line count) instead of splitting tracked vs scratch.

The worktree-cleanup playbook steps 4–5 were rewritten to match: show tracked diffs and list untracked/ignored paths, default to keeping any wip worktree until the user explicitly approves every path removal, and prune with git worktree remove only (no --force, no rm -rf, no prune to override Git refusals), with a status preflight right before each removal.

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