Summary

• add first-class bytes support across the Typesync definition, schema, conversion, validation, and generator layers
• emit the correct platform-specific types for Firestore bytes values:
  • TypeScript: Buffer, firestore.Bytes, and firestore.Blob depending on target
  • Python: bytes
  • Swift: Data
  • Firestore Rules: bytes
• add emulator-backed integration coverage proving bytes round-trip correctly in TypeScript, Python, and Swift, plus rules coverage for bytes validation

Test plan

• yarn test:compile
• yarn test:src
• yarn test:integration

Notes

• yarn test:rules still has 2 pre-existing unrelated failures in the existing readonly-field/user rules flow
• the new bytes-specific rules coverage passes