Add Python wire codec binding

[haasonsaas]

Summary

• add dependency-free Python SessionRPC wire codec binding
• add Python unit tests for frame roundtrip and truncated-frame rejection
• wire a Python CI job alongside Rust and TypeScript

Validation

• cargo fmt --check
• cargo test --all-targets
• npm test (bindings/typescript)
• PYTHONPATH=. python3 -m unittest discover -s tests (bindings/python)

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pypi/​setuptools@​82.0.1

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