* fix: expand override.category and explicit reasoningEffort priority (#1219)
Two bugs fixed:
1. createBuiltinAgents(): override.category was never expanded into concrete
config properties (model, variant, reasoningEffort, etc.). Added
applyCategoryOverride() helper and applied it in the standard agent loop,
Sisyphus path, and Atlas path.
2. Prometheus config-handler: reasoningEffort/textVerbosity/thinking from
direct override now use explicit priority chains (direct > category)
matching the existing variant pattern, instead of relying on spread
ordering.
Priority order (highest to lowest):
1. Direct override properties
2. Override category properties
3. Resolved variant from model fallback chain
4. Factory base defaults
Closes#1219
* fix: use undefined check for thinking to allow explicit false
YeonGyu-Kim
23b49c4a5c