Apply ZFC (Zero Forge Cache) principle across git error handling and
feed curation. Agents now observe raw git output and make their own
decisions rather than relying on pre-interpreted error types.
- Add GitError type with raw stdout/stderr for observation
- Add SwarmGitError following the same pattern
- Remove in-memory deduplication maps from Curator
- Curator now reads state from feed/events files
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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