Allow per-project skill path exclusion (or per-skill disable) for monorepos with non-Next.js apps

[ajbau]

In a monorepo where one app is Next.js (apps/web/) and another is Expo / React Native (apps/mobile/), the nextjs and next-cache-components skills produce false-positive PostToolUse suggestions on every mobile-file edit, because their pathPatterns are wide enough to swallow both apps.