fix(server): cfg-gate accept-backoff TEST libc errnos for Windows

[pilotspacex-byte]

Follow-up to #242's Windows fix: the resource_exhaustion_classification unit test in accept_backoff.rs also references libc:: errnos, so the main-push Windows check still fails E0433 on the test build (the Windows job is skipped on PRs — neither the original break from #230 nor the partial fix could be caught pre-merge). The test is now cfg-split the same way as the function under test: unix keeps the libc errnos, Windows uses WSAEMFILE (10024) / WSAENOBUFS (10055) / WSAECONNABORTED (10053).

Verified: cargo test --lib server::accept_backoff 4/4, fmt clean, and grep confirms every libc:: site in the file is now behind #[cfg(unix)].

Summary by CodeRabbit

• Bug Fixes
  • Improved cross-platform handling for a server error classification test, ensuring it now works correctly on both Unix and Windows systems.
  • Corrected platform-specific error handling so resource exhaustion and connection reset cases are validated with the appropriate error codes on each OS.
• Documentation
  • Updated the changelog to reflect the broader Windows build fix coverage.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8a7afa9f-5217-4c5b-a9e5-c982fb6e65c2

📥 Commits

Reviewing files that changed from the base of the PR and between 6e2ae82 and 4f91cbd.

📒 Files selected for processing (2)

• CHANGELOG.md
• src/server/accept_backoff.rs

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📝 Walkthrough

Walkthrough

The resource_exhaustion_classification unit test in accept_backoff.rs is updated to construct platform-specific error codes using cfg(unix) versus cfg(not(unix)) branches instead of unconditional libc constants. The CHANGELOG.md entry is updated to describe this test fix.

Changes

Test cfg-splitting fix

Layer / File(s)	Summary
Platform-specific error construction in test src/server/accept_backoff.rs, CHANGELOG.md	The test now conditionally builds EMFILE/ENFILE and ECONNABORTED errors using libc on Unix and numeric WSA codes on non-Unix; changelog note extended to mention this test update.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Related Issues: None specified

Related PRs: None specified

Suggested labels: windows, tests, changelog

Suggested reviewers: None specified

🐰 A rabbit hopped across the platform divide,
Errno on one side, WSA on the other side,
Tests now cfg-split with care,
Windows builds no longer despair,
Changelog notes the fix with pride.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: cfg-gating the accept_backoff test’s libc errno usage for Windows.
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.

✨ 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 fix/win-accept-backoff-tests

Warning

Tools execution failed with the following error:

Failed to run tools: 13 INTERNAL: Received RST_STREAM with code 2 (Internal server error)

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