Canonicalize offline sync row footprints

[rdlabo]

Summary

• use the repository's schema-aware physical row key throughout enqueue, replace, ACK, and discard companion handling
• reject cross-aggregate and multi-scope commands that alias the same user-scoped replica row before persistence
• preserve partition-scoped independence while preventing Web/SQLite last-write ambiguity

Verification

• OfflineSyncService: 118/118
• repository/sync/pull focused: 273/273 before the final two service cases
• Kit lint
• git diff --check

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.