Require Post-Merge Worktree Cleanup

[ptr727]

Summary

• make worktree and branch cleanup a required post-merge terminal step
• safely handle squash-merged branches through live PR and clean-tree verification
• return the primary checkout to fetched, fast-forwarded develop
• route PR, promotion, and release completion through the cleanup procedure

Validation

• python3 scripts/build_dist.py --check
• python3 scripts/tests/test_build_dist.py
• python3 scripts/prose_lint.py --check sentence-length --diff origin/develop
• python3 scripts/prose_lint.py --check sentence-split --diff origin/develop
• markdownlint-cli2 over 158 Markdown files
• git diff --check

[Copilot]

Pull request overview

This PR updates the fleet skill documentation to make post-merge worktree/branch cleanup a required terminal step, including special handling for squash merges and restoring the base clone to a fetched, fast-forwarded develop.

Changes:

• Expand repo-worktree to require verified post-merge cleanup (including a narrow git branch -D post-squash exception with live PR + clean-tree proof).
• Require the post-merge cleanup procedure as part of the PR review loop and after promotions/releases.
• Sync these rule changes across the .github/skills, .agents/skills, and .claude-plugin skill distributions (including digest update).

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
.github/skills/repo-worktree/SKILL.md	Defines the required post-merge cleanup and base-clone reset to develop.
.github/skills/pr-review-conduct/SKILL.md	Makes cleanup part of the required post-merge PR loop completion.
.github/skills/operational-vs-release-workflow/SKILL.md	Requires cleanup after squash merges and after promotion/release completion.
.github/skills/git-commit-conventions/SKILL.md	Clarifies destructive-command policy and documents the narrow post-squash branch deletion exception.
.claude-plugin/fleet-skills/skills/repo-worktree/SKILL.md	Synced plugin distribution copy of repo-worktree.
.claude-plugin/fleet-skills/skills/pr-review-conduct/SKILL.md	Synced plugin distribution copy of pr-review-conduct.
.claude-plugin/fleet-skills/skills/operational-vs-release-workflow/SKILL.md	Synced plugin distribution copy of operational-vs-release-workflow.
.claude-plugin/fleet-skills/skills/git-commit-conventions/SKILL.md	Synced plugin distribution copy of git-commit-conventions.
.claude-plugin/fleet-skills/.source-digest	Updates the plugin digest to match the new skill content.
.agents/skills/repo-worktree/SKILL.md	Synced agent distribution copy of repo-worktree.
.agents/skills/pr-review-conduct/SKILL.md	Synced agent distribution copy of pr-review-conduct.
.agents/skills/operational-vs-release-workflow/SKILL.md	Synced agent distribution copy of operational-vs-release-workflow.
.agents/skills/git-commit-conventions/SKILL.md	Synced agent distribution copy of git-commit-conventions.

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