GetHostAgentConfig was loading profiles and assignments from disk on
every agent report (every 10-30 seconds per host). With multiple hosts,
this caused disk I/O contention that eventually led to request timeouts.
Added in-memory caching with 60-second TTL:
- Fast path reads from cache without locks when valid
- Double-checked locking pattern for cache refresh
- Cache auto-invalidates after TTL, no manual invalidation needed
rcourtman
204a9fe084