Adds support for repository-specific personas. When --persona is
specified, review-bot now:
1. Checks the target repo's .review-bot/personas/<name>.yaml directory
2. Falls back to built-in persona if not found in repo
This allows repos to define domain-specific personas (trading, regulatory,
etc.) or override built-in personas with project-specific rules, without
requiring changes to CI configuration.
Implementation:
- New review.PersonaFetcher interface for abstracting Gitea API access
- review.LoadRemotePersonas() with graceful fallback on 404
- review.MergePersonas() for combining remote and built-in personas
- giteaFetcher adapter in main.go to bridge gitea.Client
The feature follows a partial-success model: invalid YAML files or
network errors for individual persona files are logged and skipped,
allowing other valid personas to load.
Closes#60
Rodin