audio-knife: request deferred parameters

[pragmatrix]

Why

AudioFork ignores subsequent client text messages, including deferred parameters, until its socket is connected. Its mod_audio_fork::connect FreeSWITCH client notification also omits the conversation ID, so clients need an explicit AudioKnife signal that identifies when to send deferred parameters for a conversation.

Summary

• Send a sendParams transport message after accepting a deferred start.
• Ignore non-text control and binary frames while waiting for deferred parameters, while treating Close as a startup error.
• Document the exchange and bump the workspace version to 3.7.1.

Validation

• cargo fmt -- --check
• cargo test

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Note

This pull request was developed with assistance from an AI coding agent alongside the author.