fix(web): scale web heap limit to container memory

Node's default old-space limit caps at ~4GiB regardless of how much memory
the container actually has. On larger deployments the web process fills that
ceiling and V8 falls into back-to-back full mark-compact collections, which
block the event loop for seconds at a time and slow every route at once.

Set --max-old-space-size-percentage on the web program so the heap scales
with the container's memory limit. Node reads the cgroup limit, so this is
proportional on every deployment size. Scoped to [program:web] via
supervisord so the backend and zoekt are unaffected.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: brendan-kellam

supervisord.conf

@@ -15,6 +15,8 @@ redirect_stderr=true
 
 [program:web]
 command=./prefix-output.sh node packages/web/server.js
+# Node's default heap limit caps at ~4GiB regardless of container memory.
+environment=NODE_OPTIONS="--max-old-space-size-percentage=75"
 priority=20
 autostart=true
 autorestart=true