isProcessAlive now catches ALL errors and returns false (pure boolean
probe). Callers use it in if/while conditions without try/catch, so
throwing on EPERM was a behavior change that could crash the CLI.
Windows path gets its safety catch restored.
safeUnlinkQuiet added for best-effort cleanup paths where throwing on
non-ENOENT errors (like EPERM during shutdown) would abort cleanup.
json() removed — dead code, never imported anywhere.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
safeUnlink (ignores ENOENT), safeKill (ignores ESRCH), isProcessAlive
(extracted from cli.ts with Windows support), and json() Response helper.
All catches check err.code and rethrow unexpected errors instead of
swallowing silently. Unit tests cover happy path + error code paths.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Garry Tan