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Amruth Pillai
e6a31aab97
The server PDF preflight spawned a fresh worker per semantic-CSS edit, each racing a 15s startup deadline to cold-load the ~721kB+5MB PDF runtime. That load is super-linear in CPU (~3s at 1 vCPU, >15s on a throttled/shared vCPU), so on a constrained box every edit hit the startup-timeout path and returned STYLESHEET_PREFLIGHT_WORKER_FAILED. Since the service only advances the applied stylesheet when preflight passes, custom styles never applied and the editor stuck on Checking. Warm one worker at boot and reuse it (message-based input, respawn on crash/timeout), so the cold load is paid once instead of per edit. Raise the render deadline 5s->30s (a rich resume renders ~5-18s on a slow box) and the readiness ceiling to 120s so the one-time warm completes even when throttled. Surface worker load failures instead of an unhandled-rejection crash, and log runner-side failure paths so the previously opaque failure is diagnosable. Verified in node:24-slim under --cpus=0.25/0.35/0.5: all reused requests pass. Claude-Session: https://claude.ai/code/session_01ULhhLQ24DvnYwzP4afDuye