Allow individual categories to be disabled via `disable: true` in config. Introduce shared `mergeCategories()` utility to centralize category merging and disabled filtering across all 7 consumption sites.
Main entry point: - create-hooks.ts, create-tools.ts, create-managers.ts - plugin-interface.ts: plugin interface types - plugin/ directory: plugin lifecycle modules Config handler: - agent-config-handler.ts, command-config-handler.ts - tool-config-handler.ts, mcp-config-handler.ts - provider-config-handler.ts, category-config-resolver.ts - agent-priority-order.ts, prometheus-agent-config-builder.ts - plugin-components-loader.ts
