beads/crew/jane d3d2326a8b feat(federation): add SQL user authentication for peer sync ...

Merge SQL user authentication with Emma federation sync implementation:

- Add federation_peers table for encrypted credential storage
- Add credentials.go with AES-256-GCM encryption, SHA-256 key derivation
- Extend FederatedStorage interface with credential methods
- Add --user, --password, --sovereignty flags to bd federation add-peer
- Integrate credentials into PushTo/PullFrom/Fetch via withPeerCredentials
- DOLT_REMOTE_USER/PASSWORD env vars protected by mutex for concurrency

Credentials automatically used when syncing with peers that have stored auth.

Continues: bd-wkumz.10, Closes: bd-4p67y

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-20 21:15:11 -08:00

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