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Extract TXT_STYLES + 13 material builder functions (txtMat, pinchHarmonicMat,
naturalHarmonicMat, palmMuteXSpriteMat, fretHandMuteXSpriteMat, muteXMat,
triMat, bendChevronMat, darkenHex, slideArrowMat, _meshMatForGhostFretDigit,
_spriteMat2MeshMat) and pool() from screen.js N-section into:
plugins/highway_3d/src/materials.js (createMaterialBuilders factory)
screen.js drops ~600 lines (15302→14705).
Surprises vs plan §4:
• DI is 4 params { getT, getTxtCache, techMatCache, techMeshMatClones } not 1
• _syncOpenStringPitchLabels cluster excluded (20+ factory-scope deps)
• _techMatCache stays in screen.js factory scope for teardown .values()/.clear()
Beyond-subst (4):
1. Factory wrapper createMaterialBuilders({...})
2. T → const T = getT() inside each function body (live accessor)
3. txtCache[k] → const cache = getTxtCache(); cache[k]
4. _techMatCache/_techMeshMatClones → DI param names techMatCache/techMeshMatClones
Tests: 16 new class-killer tests in highway_3d_materials.test.js;
pool warm tests retargeted to src/materials.js; panel_controls stub added.
Full suite: 1246/1248 pass (2 pre-existing: network + nut-labels).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014uZ169yfoFYArXz962g7KW