feat: honor cljs blink trigger randomness overrides

[meekmachine]

Summary

• allow manual CLJS blink triggers to override randomness per call
• tighten smoke coverage for deterministic manual blink overrides
• assert blink snippet metadata for category, priority, playback rate, intensity scale, and autoplay

Validation

• npm run test:cljs
• npm run typecheck
• npm test
• npm run build

Refs #5
Refs #15