v0.12.0

Changelog

• b16798b Overhaul TUI forms, footer, and cross-extension comment flow
• 5248628 Add Memo extension
• ac6cd6b Auto-merge gitmsg/* branches on push and fetch
• 747b0ae Verify the latest edit commit alongside the canonical
• 753128c Drop stale Phase 1/2 scope-migration note in settings/scopes.go
• 8ddad0a Update README.md: link to lists spec
• 9c5410f Stop attributing commits to tag refs in core_commits