hero-3d Phase 8B: kill streak, drop rails, fill the void under header

Address direct visual feedback on the previous iteration:

- Camera elevated to (0, 5, 9.5) and tilted further down (lookAt y=-0.6,
  z=-4) so the back ridges actually fill the upper viewport — no dark
  band between the header and the wireframe
- Terrain extended (54×56 unit, 200×160 segments) and amplitude bumped
  6.2→7.5 so peaks reach the top of the frame
- Removed the OUTPUT_RAILS entirely (the cyan "stripes from the centre"
  read as artifacts, not data flow)
- Reduced INPUT_FLOWS to five thinner curves at lower opacity (0.32)
  and pulled origins inward; UnrealBloom strength dropped 0.55→0.32 so
  bright wires no longer smear into a vertical streak on the left edge
- Rewrote shader distance fade to only kick in at the very far back
  (z<-22) so back mountains stay visible
- Peak label anchors lowered (Y 4–9 → 0.6–2.0) so projected dots land
  on the visible ridge silhouettes rather than at the foot
- Sync init projection: camera.updateMatrixWorld + projectPeakLabels
  before the first rAF tick so labels appear immediately
- Responsive: hide databases/observability below 1280, vms/networking
  below 1024 — prevents inner labels from crowding the centre title

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>