Fix unnecessary delay in the port tracking loop

[Feng Wang (chemwolf6922)]

Summary of the Pull Request

Before this change, an additional 10ms delay was added in the port tracker loop presumably to make the main loop slower than the worker loop. So, the worker result does not get super dated. This is not reliable. And the 10ms delay also slows down every consecutive bind call.

This PR refactors the thread synchronization method. So, the timing between those two loops is more deterministic. And removes the performance penalty for all bind calls.

PR Checklist

• Closes: bind() takes ~10 ms for every socket family under WSL2, independent of networking mode #41470
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

Measure 100 consecutive bind calls for different AF.

Type	Before	After
netlink	1030ms	56ms
UDS	1008ms	57ms
UDP bind 0	2174ms	1135ms

The extra UDP bind 0 time is from the getsockname poll. Which is required.

[Copilot]

Pull request overview

This PR removes an unnecessary per-bind() delay in the Linux init port-tracking path by replacing the prior timeout/promise-based synchronization with a single event stream (seccomp notifications + periodic port refresh results), aiming to make the coordination between the main loop and the refresh worker deterministic and faster.

Changes:

• Refactored GnsPortTracker to use WaitableValue<std::variant<...>> for event delivery and a separate WaitableValue<bool> for refresh acknowledgements.
• Removed the previous std::promise/std::future polling and the associated short poll timeouts from the main loop.
• Updated WaitableValue to support move semantics for posted/retrieved values.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/linux/init/waitablevalue.h	Switches post/get/try_get to move-based storage/return to avoid unnecessary copies.
src/linux/init/GnsPortTracker.h	Replaces promise/future refresh plumbing with a TrackerEvent variant and new waitable signals.
src/linux/init/GnsPortTracker.cpp	Refactors the main loop into an event-driven design and removes timeout-based polling delays.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.