fix: dotenv priority in scripts, add connection lines to constellation
- all scripts now prioritize .env file over environment variables
(fixes stale env var overriding fresh .env keys)
- purged 4 remaining bridgy fed vectors from turbopuffer
- rebuilt constellation data (38,624 points, 81 coarse / 414 fine clusters)
- added post-particles-inspired connection lines between nearby points
when zoomed in (>= 3x), using spatial index for O(n) performance
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>