refactor: migrate to CreatePromise pattern and introduce KV worker

Richard T. Carback IIIrequested to merge
v0.4 into release
  • Migrated wasm/ files to CreatePromise w/ proper async handling
  • New KV worker architecture replacing state worker
  • Created internal jsutil/ package replacing wasm-utils dependency
  • Migrated to goccy/go-json for WASM performance
  • Standardized error handling with JavaScript Error objects
  • Upgraded Go 1.21 → 1.25.3
  • Removed state worker
  • Use modern, unmodified wasm_exec, so we don't have upgrade pain moving forward.

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