romm OOM storm on demo-hp: fixed, measured, closed (R-635)

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Found because the operator heard the fans. romm 5.3.0 was promoted that morning; the update read
`done` and the app ran clean for two hours, then OOM-crash-looped for six - 4530 worker SIGKILLs,
~500% CPU, host load 5.2 while otherwise idle, and nothing alarmed.

Raising the limit to 768M was still a guess and fixed nothing (memory.peak hit exactly 768 MiB).
Measured instead: ~216 MiB per warm uvicorn worker, so the image's default of 4 workers needs
~882 MiB. /init reads WEB_SERVER_CONCURRENCY; set to 2.

Proven under load, not just at idle: 26,645 requests over 300 s, memory 416-614 MiB against 768,
trending down, zero SIGKILLs, OOMKilled false. Idle CPU 500% -> 1.64%.

The first soak measured nothing - it was pointed at the scratch-guest subdomain, every request
404'd at traefik in 9 ms, and the counter reported 14,026 successes. Positive and negative controls
are now asserted before any load is driven.

Carried into R-462: `proven` has meant "the update applied and the data survived", not "the new
version runs".

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

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