Fix 0.x migration: format-profile frontmatter refresh

[bmadcode]

Found upgrading a real 0.x studio: never-overwrite correctly protects creator profiles, but leaves them missing the 1.0 frontmatter keys mc-beats requires (beat-types, density).

• New mc-setup script merge_profile_frontmatter.py: adds missing top-level frontmatter keys from the shipped profile (raw-line copy, formatting preserved); existing keys, prose, and Learnings untouched byte for byte. Tested (4 cases).
• Migration step 1a now runs it per profile and offers to relocate a pre-1.0 brand-root series template into {brand-path}/templates/.md.
• CHANGELOG gains the 1.0.1 section.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f4a83bb2-b5c4-4e4b-840c-7379ef03de04

📥 Commits

Reviewing files that changed from the base of the PR and between 728dfbd and ba57066.

📒 Files selected for processing (4)

• CHANGELOG.md
• skills/mc-setup/SKILL.md
• skills/mc-setup/scripts/merge_profile_frontmatter.py
• skills/mc-setup/scripts/tests/test-merge_profile_frontmatter.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release-1.0

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