Implement native 0x202 color interpolation

docs/opcode-reference.md

@@ -132,14 +132,14 @@ SC0000 label_1235a reaches this when the OR of 0x1c7 message-skip and 0x1cc read
 - **evidence:** Ghidra handler 0x4227b0 (dispatch ctx[0x26c93+0x1ff]); FUN_0047e800(op1,(float)op2,(float)op3,(float)op4).
 
 ### 0x202 `gfx-blit-color` (gfx-blit-color, argc 5)
-- **summary:** 0x202 (handle)(x)(y)(alpha)(color) — gfx cmd-type 0xb. Handler gfx_op_0x202_blit_color @0x4228d0: worker gfx_op_0x202_worker_set_color_anim @0x47ea00 sets an ANIMATED color/alpha target (obj+0x64) + anim bit; packs ARGB from alpha(op4, ≥0x100→0xff, <0→FUN_0047f3e0) and color(op5, <0→FUN_0047f3e0). C# VM (2026-07-08 blend slice): routes through GfxState.SetObjectColor → the compositor applies STATIC alpha/tint (BlendKind.Alpha); smooth color-anim interpolation deferred. See docs/engine-re.md §Blend & transparency.
+- **summary:** 0x202 (handle)(delay_ms)(duration_ms)(alpha)(color) — arm the one-shot packed-ARGB channel. Worker gfx_op_0x202_worker_set_color_anim @0x47ea00 resets shared start obj+0x34, writes delay +0x38, duration +0x4c, and target +0x64. gfx_object_apply_transform_channels @0x472f00 linearly interpolates each byte from current +0x60 on frame clock ctx+0xb550, commits the target, clears timing, writes target -1, and clears the one-shot active bit when all sibling channels finish. Negative alpha/RGB independently preserve current bytes. Implemented in GfxState with synchronized current/target timeline evidence; draw-string 0x204/0x7a remains separate.
 - **grounding:** source=investigation, confidence=high
-- **evidence:** Ghidra handler 0x4228d0 (dispatch ctx[0x26c93+0x202]); packs (alpha<<24|rgb) from operands 4/5, FUN_0047ea00(op1,op2,op3,packed).
+- **evidence:** Ghidra handler 0x4228d0 packs operands 4/5 and calls worker 0x47ea00(handle,delay,duration,packed). Consumer 0x472f00: shared start +0x34; color delay/duration +0x38/+0x4c; current/target +0x60/+0x64; frame clock ctx+0xb550; bytewise integer LERP; natural or ctx+0xb55c forced completion. /v2 annotated and saved 2026-07-10.
 
 ### 0x203 `gfx-draw-color` (gfx-draw-color, argc 4)
-- **summary:** 0x203 (handle)(mode)(alpha)(color) — gfx cmd-type 9. Worker stores mode at obj+0x30 and STATIC packed color at obj+0x60. Negative alpha/RGB preserve current static bytes through FUN_0047f3e0. Mode 2 is the 0x223 transition-source alpha/identity path (0xffffffff = opaque identity, not solid white); mode 0 retains the established tint-strength behavior.
+- **summary:** 0x203 (handle)(mode)(alpha)(color) — gfx cmd-type 9. Worker stores the D3D blend selector at obj+0x30 and STATIC packed color at obj+0x60. Negative alpha/RGB preserve current static bytes. Mode 0 retains established opaque CG/tint/fill behavior; mode 1 is SRCALPHA/INVSRCALPHA with ARGB alpha opacity and multiplicative RGB modulation; mode 2 is the 0x223 transition-source identity path.
 - **grounding:** source=investigation, confidence=high
-- **evidence:** Ghidra handler 0x4229a0 (dispatch ctx[0x26c93+0x203]); negative operands read current obj+0x60 via FUN_0047f3e0, then gfx_op_0x203_worker_set_color stores op2 at obj+0x30 and packed ARGB at obj+0x60. SC0000 transition setup uses mode 2 with -1/-1 before 0x21d/0x223; synchronized window pixels prove treating 0xffffffff as generic white tint is wrong.
+- **evidence:** Ghidra handler 0x4229a0; negative operands read current obj+0x60, then worker 0x47e9b0 stores op2 at obj+0x30 and ARGB at +0x60. gfx_object_composite call-site 0x47f78f passes +0x30/+0x60 directly to gfx_object_blit_d3d9; mode 1 sets D3DRS SRCALPHA/INVSRCALPHA and the packed color is the device draw modulation. Mode 2 transition setup and synchronized pixels prove 0xffffffff is identity, not solid white.
 
 ### 0x208 `get-texture-size` (get-texture-size, argc 3)
 - **summary:** 0x208 (slot)(out_w)(out_h) — writes the loaded texture's width/height into two output globals; keystone for bytecode-computed sprite/bg geometry (SC0000 label_12649)