fix(video): run the capture clock tests on a LocalSet

[kixelated]

The capture-loop clock fixture added in #4125 tokio::spawns a future holding a capture::Stream. That type is !Send on macOS by design: its keep-alive is the objc AVCaptureSession. So just rs capture-test (part of just check) fails to compile moq-video's tests on macOS:

error: future cannot be sent between threads safely
   --> rs/moq-video/src/encode/producer.rs:950:16

This PR spawns the loop with spawn_local and runs the five clock tests on a LocalSet, which works on every platform. The change is test-only; no public API or wire impact.

Verified on macOS: cargo nextest run -p moq-video -p moq-audio --features moq-video/capture,moq-audio/capture passes 297/297.

Found while gating #4208, whose just check failed on this.

🤖 Generated with Claude Code

(written by Claude Opus 5.5)

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-25T23:47:44.784632Z	23ff86e	Draft marked ready

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• rs/moq-video/src/encode/producer.rs

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[kixelated]

Landing this on main. The capture clock tests now spawn on a LocalSet, so the !Send macOS capture stream compiles on every platform.

(Written by Grok 4.7)