refactor(h3d-carve-17): cut-17 — alias removal + stale doc comment cleanup

Cleanups:
- scene-init.js: remove dead DI alias getHighwayCanvas:_getHighwayCanvasAlias (Creed note)
  setHighwayCanvas now correctly gains its own line in the DI block
- note-renderer.js: two stale line-number refs → module-relative refs (Toby r4 LOW)
- arp.js: stale 'at line 4025' doc comment → 'factory-scope fn in screen.js'

Gates:
- ESLint: 0 errors on scene-init.js
- plugin.json: 3.52.0 → 3.53.0
- Tests: 448/448 (alias kill test added; DI count repinned 178→179; version test updated)
  Note: DI count is 179 post-edit (setHighwayCanvas promoted to line-first position)

CAF sweep: waived (no setter-arg changes in scope)

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": "3.52.0",
+  "version": "3.53.0",
   "type": "visualization",
   "scriptType": "module",
   "bundled": true,

plugins/highway_3d/src/arp.js

@@ -21,7 +21,7 @@ export function createArp({
     // ── plain const shorthand (fn refs or number consts, never reassigned) ──
     validString,            // IIFE fn decl ~line 3736
     filterValidNotes,       // IIFE fn decl ~line 3767 — used by arpeggioLaneDividerFrameAccentMul
-    sY,                     // const fn at line 4025: s => S_BASE + (...) * S_GAP (captures live vars)
+    sY,                     // factory-scope fn: s => S_BASE + (...) * S_GAP (captures live vars)
     K,                      // module-level const line 124
     S_GAP,                  // module-level const line 203
     BEHIND,                 // module-level const line 206

plugins/highway_3d/src/note-renderer.js

@@ -1,7 +1,7 @@
 // h3d-carve-14: V-section (note renderer) → src/note-renderer.js
 // Source: plugins/highway_3d/screen.js lines 10172–11604 (pre-cut).
 // Factory pattern: createNoteRenderer({DI}) → { drawNote, drawArpBrackets, drawNotedetectLabels, chordHarmonyLabels }
-// chordHarmonyLabels is also called from update() (U-section) at line 9016.
+// chordHarmonyLabels is also called from update() (U-section) in src/renderer.js.
 //
 // DI surface: 130 params
 //   - 27 constants (shorthand)
@@ -928,14 +928,14 @@ export function createNoteRenderer({
                     // open-note body. Fretted notes keep the
                     // single-trail path. Offsets are scaled by
                     // `openWScale` (the same body-width scale
-                    // computed at line 7367) so the trails stay
-                    // underneath the body's edges no matter how wide
+                    // computed above via openChordBoxWidth) so the trails
+                    // stay underneath the body's edges no matter how wide
                     // the anchor lane is. Chord-member open strings
                     // can't reach here (guarded at the `hasSus`
                     // check above).
                     //
                     // openTrailOff is always > 0 because openWScale
-                    // is clamped >= 0.22 at line 7368 (or defaults
+                    // is clamped >= 0.22 above (or defaults
                     // to 1 when there's no openChordBoxWidth), so
                     // openTrailOff >= NW * 3 * 0.22 = 3.3 * K.
                     // No degenerate-small-offset fallback needed.

plugins/highway_3d/src/scene-init.js

@@ -84,7 +84,7 @@ export function createSceneInit({
     getBeatG, setBeatG,
     getLblG, setLblG,
     getLyricsCanvas, setLyricsCanvas, setLyricsCtx,
-    getHighwayCanvas: _getHighwayCanvasAlias, setHighwayCanvas,
+    setHighwayCanvas,
     getVisibilityHandler, setVisibilityHandler,
     getCanvasReplacedHandler, setCanvasReplacedHandler,
     getOnCtxLost, setOnCtxLost,