chore: bump @harperfast/integration-testing to 0.5.1

[heskew]

Bumps the @harperfast/integration-testing harness to 0.5.1, picking up the startup-readiness and teardown/loopback-recycle race fixes (HarperFast/integration-testing#8).

This repo was on 0.3.0, so the jump crosses two behavioral changes worth watching in CI:

• loopback pool now starts at 127.0.0.2 (was 127.0.0.1)
• startupTimeoutMs / …_STARTUP_TIMEOUT_MS now means the idle / no-output window, not an absolute deadline

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[gemini-code-assist]

Code Review

This pull request updates the @harperfast/integration-testing development dependency from version 0.3.0 to 0.5.1 in both package.json and package-lock.json. Additionally, it removes several libc constraints (glibc and musl) from platform-specific optional dependencies in package-lock.json. There are no review comments, and I have no additional feedback to provide.

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[claude]

Reviewed; no blockers found.

[github-actions]

Reviewed; no blockers found.