findClaudeProcess() was calling `ps -eo pid,tty,args` once per session.
On machines with ~1150 processes, each `ps` call takes 30-35s. With 18
sessions enriched in parallel, this caused /api/sessions to take 51+
seconds despite the 2s per-session timeout.
Add a module-level TTL cache (5s) with in-flight deduplication so `ps`
is called at most once regardless of session count. Also reduce timeouts
from 30s to 5s — stale process data isn't useful.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
c1902ce086