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.
- Split 25+ index.ts files into hook.ts + extracted modules - Rename all catch-all utils.ts/helpers.ts to domain-specific names - Split src/tools/lsp/ into ~15 focused modules - Split src/tools/delegate-task/ into ~18 focused modules - Separate shared types from implementation - 155 files changed, 60+ new files created - All typecheck clean, 61 tests pass