[max-sixty]

Bumps 0.79.0 → 0.80.0 and adds the ## 0.80.0 changelog section, cut from 12efb5159. The bump is minor because the library API breaks (see Verification).

Verification

• cargo run -- hook pre-merge --yes on the cut tip: 4985 passed.
• nightly.yaml on 12efb5159, all jobs green including feature-powerset: https://github.com/max-sixty/worktrunk/actions/runs/36338233859
• cargo semver-checks check-release -p worktrunk reports five major-level lints, the removals and signature changes listed in the Internal entry.
• Changelog: repeated verification passes against source until one came back clean. Fixed headlines name the condition a bug needed rather than its worst case, and near-zero-reach fixes are folded into two roll-up bullets, per Tie a changelog fix's prominence to its reach #4295.
• Data-loss surface review over v0.79.0..HEAD with independent finders. The one real finding, a nested stale detached worktree read as the enclosing repo's rebase so wt step prune could unregister it, was fixed in fix(list): read a stale worktree's rebase state from its registration #4302. The review also found a squash regression in the backup path, fixed in fix(squash): back up the index with plumbing so hidden submodule changes don't abort the squash #4303. The remaining candidates were adjudicated acceptable and signed off: fix(prune): unregister stale worktrees whose directory remains #4228 unregistering stale worktrees whose directory remains (files stay on disk; the branch is deleted only if integrated), fix(squash): commit on a detached HEAD so a failed squash keeps the branch #4206 leaving a detached HEAD on Ctrl-C during a slow commit hook, fix(merge): respect stage scope before auto-commit #4251 allowing --no-squash merges with untracked files, skills(worktrunk): drop --no-hooks from the sub-Agent example #4219 dropping --no-hooks from the skill example, and fix(logs): report real branch names in hook-output JSON; fix tips recipes wt rejects #4279's docker stop recipe. Prevent removal of submodule changes hidden by config #4252 closes a submodule data-loss path.

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