When a non-main group is re-registered with --is-main, the existing
CLAUDE.md (copied from global template) lacked admin context. Now
register.ts detects this promotion case and replaces it with the main
template. Files that already contain "## Admin Context" are preserved.
Adds tests for:
- promoting non-main to main upgrades the template
- cross-channel promotion (e.g. Telegram non-main → main)
- promotion with custom assistant name
- re-registration preserves user-modified main CLAUDE.md
- re-registration preserves user-modified non-main CLAUDE.md
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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