Refactor: Binary intent key encoding for performance
Convert intent keys from string format to binary encoding:
- Version byte + table prefix + typed PK values
- DDL keys: 0xFE marker + table name
- DB-op keys: 0xFF marker + database name
- Use PK declaration order (not alphabetical)
- Precompute IntentKeyPrefix in SchemaCache
- Base64url encoding at JSON/HTTP boundaries
- XXH64 hashing for conflict detection
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Co-Authored-By: Claude Opus 4.5 <
[email protected]>
