[experiment] Benchmark pnpm vs Bun on CircleCI

[Finesssee]

Experiment only

Do not merge. This draft PR exists only to activate the repository's CircleCI GitHub App webhook path for a package-manager benchmark.

Three equal Windows win/default medium lanes run the same Node/Vitest/TypeScript/Vite workload after dependency installation:

• current pnpm 11.24.0
• proposed pnpm 11.25.0
• Bun 1.4.2

The Bun lane uses an experiment-only bun.lock plus minimumReleaseAge = 86400, isolated linking, and disabled dependency lifecycle scripts. Node remains the runtime for tests/build tools so this measures package management rather than Bun-runtime compatibility.

Plan: one cold-cache run followed by two unchanged warm-cache runs. No product/release behavior should be merged from this PR.

[coderabbitai]

Important

Draft PR not reviewed

Draft PRs are not automatically reviewed by default.

• Trigger a manual review

To automatically review draft PRs, update your CodeRabbit configuration:

reviews:
  auto_review:
    drafts: true

---

_{Comment @coderabbitai help to get the list of available commands.}

[Finesssee]

Bun-only runtime benchmark result

Completed three real CircleCI Windows win/default medium runs with Node, npm, Corepack, and pnpm explicitly removed from PATH before the JS workload.

Run	Bun install	Vitest under Bun	Production build under Bun	Tauri CLI	Fully Bun-only
1	4.041s	FAIL, 27/48 files	PASS, 12.177s	PASS	No
2	2.048s	FAIL, 27/48 files	PASS, 13.104s	PASS	No
3	2.034s	FAIL, 27/48 files	PASS, 10.095s	PASS	No

Every run independently asserted node, npm, corepack, and pnpm were unavailable.

Conclusion: Bun 1.4.2 can replace pnpm for install and can drive the production frontend build + Tauri CLI without Node, but Win-CodexBar cannot remove Node yet because the current Vitest/jsdom test contract is not compatible with Bun's runtime.

Additional disposable migration probe using Bun-native bun test + Happy DOM + a small vi compatibility shim improved discovery to 265 tests, but still left 79 failures + 10 errors. Concrete blockers include 40 vi.hoisted uses, 5 partial vi.mock(... importOriginal ...) factories, missing/incompatible vi.setSystemTime and other mock/timer/global helpers, plus accessor-spy differences.

This remains an experiment-only draft and should not be merged as-is.