0.0.1: feat: add notes-no-messages prompt storage mode and make it default
Add a new prompt_storage mode that stores attestations and metadata in git notes but excludes conversation messages. This is now the default, providing attribution tracking without storing full prompts in notes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>