chore(moq-native): remove tokio-console instrumentation

[kixelated]

Summary

Removes the tokio-console integration from moq-native and the repo-wide tokio_unstable build flag it required.

• rs/moq-native/src/log.rs — drop the #[cfg(feature = "tokio-console")] console_subscriber::spawn() layer.
• rs/moq-native/Cargo.toml — remove the tokio-console feature and the console-subscriber dependency.
• .cargo/config.toml — deleted. Its only contents were rustflags = ["--cfg", "tokio_unstable"], which was only needed by console-subscriber.
• demo/relay/justfile — drop TOKIO_CONSOLE_BIND from the default recipe and remove the console recipe (port 6680).
• demo/pub/justfile — remove the console recipe (port 6681).
• Cargo.lock — console-subscriber and its transitive deps dropped.

Why

The tokio-console instrumentation was unused, and dropping it lets us also remove the tokio_unstable cfg that was applied to every crate in the workspace.

Notes for reviewers

• Removing the tokio-console cargo feature is a feature-surface change, but there are no external consumers yet.
• Dropping tokio_unstable means any code relying on unstable tokio APIs would now fail to compile. cargo check -p moq-native passes, so nothing in-tree was using it.

Test plan

• cargo check -p moq-native (via nix develop) passes
• just check

(Written by Claude)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 665faa2d-dac7-468c-820d-5ef0aa076ed7

📥 Commits

Reviewing files that changed from the base of the PR and between 28505fc and c79c4be.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (5)

• .cargo/config.toml
• demo/pub/justfile
• demo/relay/justfile
• rs/moq-native/Cargo.toml
• rs/moq-native/src/log.rs

💤 Files with no reviewable changes (4)

• rs/moq-native/src/log.rs
• .cargo/config.toml
• demo/pub/justfile
• rs/moq-native/Cargo.toml

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Walkthrough

This pull request removes tokio-console diagnostic tooling support throughout the codebase. The native crate no longer exports a tokio-console optional feature or includes the console-subscriber dependency, and the Log::init function stops conditionally registering the console subscriber with the tracing registry. Development justfile recipes that provided tokio-console helper tasks for the relay (port 6680) and publisher (port 6681) are deleted, and the relay's default task no longer sets the TOKIO_CONSOLE_BIND environment variable.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title clearly and accurately summarizes the main change: removing tokio-console instrumentation from the moq-native crate.
Description check	✅ Passed	The pull request description is comprehensive and directly related to the changeset, detailing specific file changes, rationale, and test status.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch claude/heuristic-goldwasser-d98b83

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