Add critical reminder to use exact PR template markup in skill

[pfefferle]

Proposed changes:

Adds a critical reminder to the PR workflow skill to always use the exact template markup from .github/PULL_REQUEST_TEMPLATE.md when creating pull requests.

This prevents custom formatting and ensures the changelog automation works correctly.

Other information:

• Have you written new tests for your changes, if applicable?

Testing instructions:

• Review the updated skill file at .claude/skills/activitypub-pr-workflow/SKILL.md
• Verify the critical reminder is clear and prominent

Changelog entry

• Automatically create a changelog entry from the details below.

Changelog Entry Details

Significance

• Patch
• Minor
• Major

Type

• Added - for new features
• Changed - for changes in existing functionality
• Deprecated - for soon-to-be removed features
• Removed - for now removed features
• Fixed - for any bug fixes
• Security - in case of vulnerabilities

Message

Add critical reminder to PR workflow skill to use exact template markup.

[Copilot]

Pull request overview

This PR adds a critical reminder to the ActivityPub PR workflow skill documentation to ensure AI tools use the exact PR template markup from .github/PULL_REQUEST_TEMPLATE.md when creating pull requests. This prevents custom formatting that would break the automated changelog generation system, which relies on specific regex patterns to parse PR descriptions.

Key changes:

• Adds a prominently formatted warning about using exact template markup
• Places the reminder before the numbered changelog workflow steps for maximum visibility

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