ci: require plugin version bump for any plugin change

[myasnikovdaniil]

Summary

PR #9 changed skills/cozystack-upgrade/SKILL.md without bumping plugin.json .version, and nothing in CI caught it. This adds an automated check so the same gap doesn't recur.

• .github/workflows/check-plugin-version-bump.yml — on PRs touching agents/, hooks/, mcp/, or skills/, asserts that every modified plugin's .claude-plugin/plugin.json .version is strictly greater (by sort -V) than on the base branch. New plugins (no manifest on base) are exempted. Failures emit a ::error file=… annotation pointing at the offending manifest.
• CLAUDE.md — documents the convention under a new ## Modifying an Existing Plugin section.

Test plan

• CI green on this PR itself (no plugin files changed → workflow short-circuits with "No plugin files changed — nothing to check.")
• Open a follow-up PR that touches a skills/<name>/ file without bumping the manifest and confirm this workflow fails it

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4c32532f-91bc-4306-8145-16d0e831c812

📥 Commits

Reviewing files that changed from the base of the PR and between d97a3d4 and 2408481.

📒 Files selected for processing (2)

• .github/workflows/check-plugin-version-bump.yml
• CLAUDE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/check-plugin-version-bump

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[gemini-code-assist]

Code Review

This pull request updates CLAUDE.md to document the requirement for version bumps when modifying existing plugins. The feedback highlights that the GitHub Actions workflow mentioned in the documentation is missing from the current changes. It is also suggested to clarify that this rule applies specifically to updates of existing plugins to avoid confusion for contributors adding new ones.