[codex] Add Quinn QUIC transport

[haasonsaas]

Summary

Adds the first real network transport for sessionrpc using Quinn.

• Adds QuicFrameTransport implementing FrameTransport over QUIC unidirectional streams.
• Adds QuicClient, QuicResumeConnection, and QuicTestServer.
• Adds QuicClient::connect_0rtt for early-data resume connections.
• Adds local QUIC conformance coverage and a 0-RTT resume test that sends a frame before waiting for handshake completion.
• Documents the QUIC adapter and 0-RTT replay caveat.

Validation

• cargo fmt --check
• cargo test --all-targets
• cargo run --example inference_session

[socket-security]

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

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	rcgen@​0.14.8

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: cargo zerocopy is 90.0% likely obfuscated Confidence: 0.90 Location: Package overview From: ? → cargo/zerocopy@0.8.48 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore cargo/zerocopy@0.8.48. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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