fix(galaxy): disable forced inward convergence that collapsed orbits to black hole

Root cause (8 parallel scouts):
- PRIMARY: applyGalaxyInwardConvergence forced 25%/minute radius contraction
  regardless of orbital velocity balance, overriding correct v=√(GM/r) mechanics.
  GALAXY_INWARD_CONVERGENCE_PER_MINUTE set to 0 (was 0.25).
- HIGH: Event horizon decay stripped 3.4% tangential velocity/tick at warp=3,
  draining angular momentum. GALAXY_EVENT_HORIZON_DECAY_RATE reduced from
  0.12 to 0.005 (24x reduction).

Orbital seeding physics (seedGalaxyOrbits, seedGalaxySystemOrbits) uses correct
softened Keplerian + logarithmic halo rotation curve — no changes needed.
The collapse was entirely caused by post-seeding controllers overriding stable
orbits with artificial density enforcement.

Author: Coding-Dev-Tools

engraphis/dashboard_assets/engraphis-graph.js

@@ -395,7 +395,7 @@
      near-horizon. This finite chart-space thickness keeps curvature local to the event horizon
      while the scale still controls smaller/custom black holes. */
   const GALAXY_EVENT_HORIZON_BAND_LIMIT = 24;
-  const GALAXY_EVENT_HORIZON_DECAY_RATE = 0.12;
+  const GALAXY_EVENT_HORIZON_DECAY_RATE = 0.005;
   const GALAXY_EVENT_HORIZON_INWARD_ACCELERATION = 0.28;
   const GALAXY_TIDAL_STRENGTH_FRACTION = 0.18;
   const GALAXY_TIDAL_ACCELERATION_CAP = 0.16;
@@ -428,7 +428,7 @@
      the previous default left 75% of a radius. The motion-rate exponent below now advances
      that same physical trajectory at 68% speed, matching the faster leapfrog clock without
      weakening the force field itself. */
-  const GALAXY_INWARD_CONVERGENCE_PER_MINUTE = 0.25;
+  const GALAXY_INWARD_CONVERGENCE_PER_MINUTE = 0;
   const GALAXY_INWARD_CONVERGENCE_SECONDS = 60;
   const GALAXY_OUTWARD_OVERRIDE = 0.10;