feat(moq-native): support websocket-only client

[kixelated]

Summary

• Widen cfg gates on Client::new(), connect(), and connect_inner() to accept the websocket feature alone (without any QUIC backend like quinn/noq/quiche)
• When no QUIC backend matches in connect_inner(), fall through to a direct WebSocket connection instead of bailing
• Allows compiling with default-features = false, features = ["websocket", "aws-lc-rs"] for WebSocket-only transport

This is useful for debugging transport-specific issues — a customer is seeing "dropped" disconnections from cdn.moq.dev, and we want them to test whether the issue is QUIC-specific by using WebSocket-only.

Test plan

• cargo check -p moq-native (default features, QUIC+WS) still compiles
• cargo check -p moq-native --no-default-features --features websocket,aws-lc-rs compiles
• WebSocket-only client connects to cdn.moq.dev successfully

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 05a38804-3318-42c9-9c85-6066d5ecb29f

📥 Commits

Reviewing files that changed from the base of the PR and between 508fedd and d7f26d5.

📒 Files selected for processing (1)

• rs/moq-native/src/client.rs

🚧 Files skipped from review as they are similar to previous changes (1)

• rs/moq-native/src/client.rs

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Walkthrough

The change adds the websocket feature to compile-time gating for the MOQ native client. Client::new, Client::connect, and connect_inner now include websocket alongside existing noq, quinn, quiche, and iroh feature checks. Error/bail messages were updated to mention WebSocket. connect_inner now conditionally attempts a direct WebSocket connection when no QUIC/i-ROH backend matched and the websocket feature is enabled.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title clearly and concisely describes the main change: adding support for WebSocket-only client compilation in moq-native.
Description check	✅ Passed	The description is well-related to the changeset, explaining the feature's purpose, implementation details, and test plan for WebSocket-only client support.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch websocket-only-client

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch websocket-only-client

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