Fixes issue #641 where users were getting banned due to rapid successive
Claude runs triggered by the synchronize event.
Changes:
- Add checkHumanActor call to agent mode's prepare() method to reject
bot-triggered workflows unless explicitly allowed via allowed_bots
- Update checkHumanActor to accept GitHubContext (union type) instead
of just ParsedGitHubContext
- Add concurrency protection to all PR review workflow examples to
prevent multiple reviews running simultaneously on the same PR
- Add tests for bot rejection/allowance in agent mode
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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