Make the reactive signal field visible - #3

Summary

• make the ambient constellation network clearly visible at rest
• strengthen pointer parallax, lensing, glow, and nearby signal connections
• add rotating cyan and magenta signal rings around the pointer
• publish the changed immutable script as reactive-field-v2.js

Validation

• ./scripts/check-repository.sh
• git diff --check
• desktop visual review at 1280×720, including calm and pointer-reactive states
• mobile visual review at 390×844
• no browser console warnings or errors
• no horizontal overflow

Performance and accessibility

• 6,894 bytes of dependency-free JavaScript within the 8 KB budget
• 115,553-byte initial transfer excluding the social preview
• unchanged reduced-motion, privacy, no-storage, and no-runtime-network boundaries