Extend the painter from a single albedo map to three paint maps:
albedo (_BaseMap), packed metallic+smoothness (_MetallicGlossMap,
R=metallic A=smoothness), and emission (_EmissionMap/_EmissionColor).
- Per-channel toggles (paint albedo / metallic+smoothness / emission)
- Metallic/Smoothness sliders and emission color + intensity brush params
- One brush shader drives all maps; metallic-smoothness uses a work
layout (R=metallic G=smoothness A=coverage) and a pack pass
(Hidden/MeshPaintPackMS) to the URP layout after each stroke
- GPU and CPU backends mirror all three maps with the same mask and
seam-dilation logic
- Material keywords (_METALLICSPECGLOSSMAP, _EMISSION) enabled and the
new maps seeded from the original material values
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