- Add RouterConfigSnapshot model with Transit ciphertext config_text
and SHA-256 plaintext hash for deduplication
- Add RouterConfigDiff model for unified diffs between snapshots
- Add RouterConfigChange model for parsed semantic changes
- Export all three from app.models barrel file
- Add unit tests for importability, table names, columns, and types
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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