fix(test): close remaining Bun review gaps

[kojiwakayama]

Summary

• serialize stale Bun workspace-lock reclamation without deleting the canonical lock directory
• add a two-process regression proving a concurrent reclaimer cannot remove the live replacement owner
• normalize Bun preload paths across slash styles and cover extension and test rewrites
• convert the Bun runner test URL with fileURLToPath for Windows

This follow-up addresses all three review threads that completed as PR #3543 entered the merge queue.

Verification

• node --test tests/bun/runner-args.test.mjs tests/bun/workspace-packages.test.mjs, 14 passed
• concurrent stale-lock regression, 20/20 isolated runs passed
• Bun 1.3.6 npm-protocol focused suite, 3 passed
• full Bun isolation runner, 1296 files passed; one pre-existing macOS native watcher assertion fails locally and is unchanged by this diff
• deno lint on all six changed files
• deno fmt --check on all six changed files
• git diff --check

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 10505e5c-7806-4f24-b15c-54b00546f1c7

📥 Commits

Reviewing files that changed from the base of the PR and between 80fb3a0 and 79a73e3.

📒 Files selected for processing (6)

• tests/bun/npm-protocol-imports.ts
• tests/bun/npm-protocol-resolution.test.ts
• tests/bun/preload.ts
• tests/bun/runner-args.test.mjs
• tests/bun/workspace-packages.mjs
• tests/bun/workspace-packages.test.mjs

✨ Finishing Touches 💡 1

⚔️ Resolve merge conflicts 💡

• Resolve merge conflict in branch fix/cross-runtime-review-followup

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/cross-runtime-review-followup

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: db67f26dc2

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[kojiwakayama]

@codex review

[kojiwakayama]

Superseded by #3551. Follow-up race review showed the interim reclaimer could either wedge after a crash or expose a later live lock to a delayed stale reader. The replacement uses generation-scoped atomic tombstones and passed the complete Bun gate (16 harness tests and 1297 Bun test files).

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

Reviewed commit: 79a73e3b1e

ℹ️ About Codex in GitHub

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• Comment "@codex review".

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