Best possible solution:

Land this PR or an equivalent narrow launcher lifecycle fix after Windows npm smokes prove status and --version exit cleanly without lingering node.exe processes or truncated output.

Do we have a high-confidence way to reproduce the issue?

Yes. The linked issue gives concrete Windows npm direct-entry commands and lingering-process timings, and current main source shows completed launcher paths can return without a final shutdown; I did not execute the Windows smoke in this Linux review.

Is this the best way to solve the issue?

Yes, with validation pending. Awaiting the version fast path and flushing launcher output before the final exit is the narrowest maintainable source fix visible from the diff; the remaining blocker is real Windows behavior proof, not another code change.

Acceptance criteria:

• On Windows with an npm-installed OpenClaw package from the PR build, run node <npm-global-openclaw>/openclaw.mjs status and verify the command completes without a lingering node.exe.
• On Windows with the same install, run node <npm-global-openclaw>/openclaw.mjs --version and verify complete output plus clean process exit.
• Keep the targeted tests from the maintainer comment green: pnpm test test/openclaw-launcher.e2e.test.ts src/entry.version-fast-path.test.ts src/cli/run-main.exit.test.ts.

What I checked:

• current_main_launcher_has_no_final_exit: Current main handles root help/browser help or imports the built entrypoint, then falls out of the launcher block without a completed-command shutdown. (openclaw.mjs:386, 7f27c42ebdb3)
• current_main_version_fast_path_is_not_awaited: Current main calls tryHandleRootVersionFastPath(process.argv) synchronously while that helper resolves version output through a promise chain. (src/entry.ts:172, 7f27c42ebdb3)
• pr_flushes_before_forced_exit: The PR adds flushWritableStream, flushProcessOutput, then awaits flushing before calling process.exit(process.exitCode ?? 0). (openclaw.mjs:383, 40a3b628d8d9)
• pr_awaits_version_fast_path: The PR changes the root version helper to return Promise<boolean> and awaits it from src/entry.ts, removing the import-completion race for --version. (src/entry.version-fast-path.ts:4, 40a3b628d8d9)
• pr_adds_regression_coverage_and_changelog: The PR updates version fast-path expectations, adds launcher help-output flush coverage, and adds a Windows CLI changelog entry. (test/openclaw-launcher.e2e.test.ts:149, 40a3b628d8d9)
• real_behavior_proof_still_pending: The PR body asserts Windows verification, but the discussion and triage: needs-real-behavior-proof label show the required npm-installed Windows smoke output/artifact has not been attached yet.

Likely related people:

• steipete: Local history/blame puts the current launcher and entrypoint lines under recent Peter Steinberger maintenance, and file shortlog shows the largest share of touches across openclaw.mjs, src/entry.ts, src/entry.version-fast-path.ts, launcher tests, and src/cli/run-main.ts. (role: recent CLI startup maintainer; confidence: high; commits: 5dfaed184608, d1f36bfd846b, c90b3e4d5ea5; files: openclaw.mjs, src/entry.ts, src/cli/run-main.ts)
• vincentkoc: Commit history ties Vincent Koc to the root --help fast path and lazy CLI startup path adjacent to the launcher output behavior changed here. (role: root help fast-path contributor; confidence: medium; commits: 38da2d076c8a; files: src/entry.ts, openclaw.mjs)
• altaywtf: The version-output path changed by this PR is connected to the merged commit that added commit-hash display to --version and updated the same entry/version tests. (role: version output contributor; confidence: medium; commits: ca5e352c53e8; files: src/entry.ts, src/entry.version-fast-path.test.ts, src/infra/git-commit.ts)

Remaining risk / open question:

• No after-fix Windows npm-installed CLI smoke proof is attached yet, so the affected node.exe exit behavior and complete stdout/stderr delivery are not live-proven on the reported platform.

Codex review notes: model gpt-5.5, reasoning high; reviewed against 7f27c42ebdb3.