refactor(skills): drop the Snapshot drift sections the pre-flight check already covers

[potiuk]

Framework-wide follow-up to #1435.

Summary

#1435 removed the hand-written Snapshot drift sections from the security skills. The same prose remained in 37 other skills and sibling files, across the pr-management, release-management, issue, contributor-growth, repo-health, pairing, setup and utilities families. Each told the agent to compare .apache-magpie.local.lock with .apache-magpie.lock and propose setup upgrade. The generated pre-flight block does that in code, including the method/URL case since #1435, and stops the run where the prose only suggested.

• The sections are removed. The Step 0 "Drift check — see Snapshot drift above" items and the pr-management adopter-config pointers now say the pre-flight block reports snapshot drift.
• write-skill's init_skill.py no longer scaffolds the section into new skills.
• Kept on purpose:
  • isolated-setup-install and isolated-setup-update: their evals grade their own drift step.
  • status: it renders drift in its dashboard.
• About 480 lines removed.

Test plan

• Hooks on commit, including the token stamps and markdownlint
• All 12 eval steps whose extracted section changed (the Step 0 drift-check line), after the change:
  • 10 steps pass fully.
  • issue-deduplicate step-0 case 3 and release-audit-report step-0 case 3 fail the same way on main, so they predate this change.

Generated-by: Claude Code (Opus 5.5)

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