Release v0.2.1

[Sreehari425]

closes #11

READY Event User Parsing

• Normalize empty string values in PartialUser string fields to None during deserialization.
• Prevent username: "" from being exposed as Some("") in typed READY event payloads.

Handshake Validation

• Require a valid DISPATCH + READY handshake response before marking clients as connected.
• Reject malformed or unexpected handshake frames more defensively in both sync and async clients.

IPC Configuration

• Apply IpcConfig to live client and transport behavior instead of leaving it as effectively dead configuration.
• Use configured values for handshake IPC version, payload size limits, socket scan count, and retry interval.

Documentation

• Refresh README, guides, and crate docs to match the current API and examples.
• Correct stale async/runtime examples and reconnect/error-handling snippets.

Testing

• Added integration coverage for READY payloads where user.username is an empty string.
• Added protocol tests for stricter handshake validation.