[codex] Fix baseline Windows OAuth login - #690

Summary

Fixes Windows login fragility points that can show up in Bun baseline compiled binaries on older hardware.

• Bound enhanced hardware fingerprinting to 3 seconds, then fall back to the existing legacy fingerprint path instead of blocking login.
• Use the native Windows URL handler for browser launch instead of the open package's Windows PowerShell path.
• Handle asynchronous spawn error events from the Windows URL handler so safeOpen() returns false instead of letting an unhandled child-process error crash the CLI.
• Reuse the shared withTimeout() helper from common/src/util/promise.ts and add shared coverage for resolve, timeout, and cleanup behavior.
• Make fingerprint logging/telemetry best-effort so prod-mode CI or pre-login startup cannot turn a valid fingerprint into a login failure.
• Add a compiled-binary --smoke-login-primitives check and run it in Windows, Linux, and macOS executable smoke paths where the built binary can run on the runner.

Root Cause

The baseline Windows binary can run on older CPUs, but the OAuth flow still depends on local startup/login steps before the browser can complete authentication. Slow or hanging hardware fingerprint commands can prevent the CLI from reaching the login URL or poll loop, Windows URL opening through PowerShell is another brittle dependency from a compiled executable, and spawn() failures are reported through an asynchronous child-process error event rather than the surrounding try/catch.

The first CI smoke also exposed that prod-mode pre-login fingerprint logging/analytics can throw before analytics initialization. That is now guarded so telemetry cannot break login primitives.

Validation

• bun test cli/src/utils/__tests__/open-url.test.ts cli/src/utils/__tests__/fingerprint.test.ts common/src/util/__tests__/promise.test.ts
• NEXT_PUBLIC_CB_ENVIRONMENT=prod bun cli/src/index.tsx --smoke-login-primitives
• NEXT_PUBLIC_CB_ENVIRONMENT=prod ./cli/bin/freebuff --smoke-login-primitives
• bun run --cwd cli typecheck
• bun run --cwd common typecheck
• git diff --check
• GitHub Actions: build-freebuff passed
• GitHub Actions: build-and-smoke-freebuff-windows passed

Notes

The workflow smoke test does not perform a real GitHub OAuth browser/account round trip. It validates the compiled executables can load and exercise the local login prerequisites that failed here: timeout behavior, fingerprint generation/classification, and Windows browser-opener command construction.