h3d-carve-11: extract R-section (string glow) into src/string-glow.js

VERBATIM-MOVE of updateStringHighlights from screen.js into a new
createStringGlow() factory. 7 DI-rewires at function entry (aliased
locals), plus 1 plain const shorthand. 8 DI params total, 0 setter
pairs, single export { updateStringHighlights }.

screen.js changes:
- Function definition (old 6610–6649) replaced with createStringGlow({…})
  factory destructure
- mStr confirmed absent from updateStringHighlights (plan row 11 stale;
  declared surprise in contract, accepted by god)
- VENUE_GEM_EMISSIVE_MUL passed as plain const shorthand (not a getter)

Tests (highway_3d_string_glow.test.js, 11 new, all green):
- Module shape + DI rewire source-scans
- Wiring-correspondence guard (createStringGlow, empty PINNED_RENAMES)
- 3 behavioral tests: emissive/opacity writes, venue multiplier,
  null-mesh slot safety — behavioral kill: gut loop → assert RED

Suite: 1317/1319 pass. Pre-existing failures #46 (legacy analyser)
and #639 (nut-labels) unchanged.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014uZ169yfoFYArXz962g7KW

plugins/highway_3d/plugin.json

@@ -1,7 +1,7 @@
 {
   "id": "highway_3d",
   "name": "3D Highway",
-  "version": "3.46.0",
+  "version": "3.47.0",
   "type": "visualization",
   "scriptType": "module",
   "bundled": true,