Consolidate the prepare and base-action phases into a single composite
step that runs src/entrypoints/run.ts. This simplifies the action.yml
from multiple steps to one execution step, while keeping the same
behavior.
Key changes:
- Add src/entrypoints/run.ts as unified entrypoint
- Simplify action.yml to single 'Run Claude Code Action' step
- Pass all inputs via environment variables
- Update base-action to accept inputs via env vars
- Support agent mode auto-detection from prompt input
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