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
+                    // computed above via openChordBoxWidth) so the trails
-                    // underneath the body's edges no matter how wide
+                    // 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,

tests/js/highway_3d_scene_init.test.js

@@ -96,9 +96,10 @@ test('createSceneInit receives ≥150 DI parameters (anti-vacuity floor)', () =>
     // Anti-vacuity floor — if regex changes and extracts 0, this fails loudly
     assert.ok(names.size >= 150, `anti-vacuity: expected ≥150 DI params, got ${names.size}`);
     // Exact pinned count — update this if DI surface intentionally changes
-    // Cut-16 tip: 183. After F2 (remove 5 dead-param lines): 178.
+    // Cut-16 tip: 183. After F2 (remove 5 dead-param lines): 178. Cut-17 alias removal: 179.
-    assert.strictEqual(names.size, 178,
+    // (removing the alias moved setHighwayCanvas to line-start, adding it to the line-first count)
-        `exact DI param count must be 178 (got ${names.size}) — update if DI surface changes`);
+    assert.strictEqual(names.size, 179,
+        `exact DI param count must be 179 (got ${names.size}) — update if DI surface changes`);
 });
 
 // ── §5 Import correctness ─────────────────────────────────────────────────────
@@ -177,10 +178,10 @@ test('_bcSyncMode no longer defined in screen.js (moved to scene-init.js)', () =
 
 // ── §8 plugin.json version bump ───────────────────────────────────────────────
 
-test('plugin.json version is 3.52.0 (bumped for cut-16)', () => {
+test('plugin.json version is 3.53.0 (bumped for cut-17)', () => {
     const pkg = JSON.parse(fs.readFileSync(pluginJson, 'utf8'));
-    assert.equal(pkg.version, '3.52.0',
+    assert.equal(pkg.version, '3.53.0',
-        'plugin.json must be bumped to 3.52.0 for cut-16');
+        'plugin.json must be bumped to 3.53.0 for cut-17');
 });
 
 // ── §9 Setter-call kill tests (§10 of contract) ───────────────────────────────
@@ -456,3 +457,9 @@ test('smoke: new-Function harness — factory construction + null-canvas early g
     // paths that require WebGL. ESLint no-undef is the compensating layer for
     // WRITE paths in sloppy-mode new-Function.
 });
+
+test('_getHighwayCanvasAlias does not appear in scene-init.js (dead alias removed in cut-17)', () => {
+    const src = fs.readFileSync(sceneInitJs, 'utf8');
+    assert.ok(!src.includes('_getHighwayCanvasAlias'),
+        '_getHighwayCanvasAlias must not appear in scene-init.js — dead alias was removed in cut-17');
+});