beta: 6.5b2

[Senophyx]

Summary

Upcoming 6.5b2 release.

Added

• Event subscription with Event enum and @rpc.on() decorator
• InvalidEvent and InvalidEventType exceptions
• utils.required_url() for button URL validation
• examples/rpc-events.py usage example

Fixed

• Invalid method annotations that broke package import
• Unread PONG corrupting RPC requests
• Incoming PING not answered
• Handshake requiring an invalid nonce
• Reader thread lifecycle and state cleanup
• Stacked handlers for the same event
• pyproject.toml license breaking wheel builds

Changed

• Single background reader with nonce routing
• Windows imports now conditional
• URL validation checks scheme and host
• set_activity() validates button URLs

Tests

51 tests passing, CI covers 3 OS and 4 Python versions.