Fix FIELD movement sprite ghosting

docs/engine-re.md

@@ -770,6 +770,16 @@ and those clones, so every copied start remains zero and their first render seed
 Those unit sprites are therefore phase-locked at one cell change every 200 ms (5 Hz), even though the
 engine generally permits different object-local starts and periods.
 
+FIELD's per-tile movement animation uses two retained objects. At `0x45c9`/`0x4686` and again at
+`0x51fd`, it clones the bound idle handle `0x9c40+entity_index` into temporary moving handle
+`0x9c40+0x76c`. The following mode-0 `0x203` write sets the idle handle's alpha to zero, while translation
+`0x220` and source-cell endpoint `0x239` animate only the temporary handle. After the presentation boundary,
+`DRAWCH@0x51ec` rebinds the idle handle at the new tile; a multi-tile route immediately repeats the
+clone/suppress cycle. Treating every static mode-0 alpha byte on a loaded texture as inert therefore leaves
+the old idle sprite composited beneath the moving clone until each segment ends. The port records the
+post-bind static-alpha consumption for looping objects as a transient opacity latch, cleared by the next
+`draw-texture` bind. This preserves ADV's distinct pre-animation/static alpha-zero CG initialization.
+
 **Port implication:** replace the current “any spritesheet is active” redraw predicate with native-style
 shared current/previous sampling and request a composition only when at least one visible sampled cell
 changes. The FIELD `sleep(1)` input-poll loop must also stop requesting a redraw when no retained mutation

docs/opcode-reference.md

@@ -667,9 +667,9 @@ The handler clears the map embedded at retained-gfx owner+0x408, resets its coun
 - **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 retained-gfx owner+0xb550 (EngineCtx+0x51b64); bytewise integer LERP; natural or owner+0xb55c (EngineCtx+0x51b70) forced completion. /v2 annotated and saved 2026-07-10.
 
 ### 0x203 `gfx-draw-color` (gfx-draw-color, argc 4)
-- **summary:** 0x203 (handle)(mode)(alpha)(color) — worker stores the D3D blend selector at obj+0x30 and STATIC packed color at obj+0x60; the handler's ctx+0x53d88 write is the generic 9-dword instruction length. Negative alpha/RGB preserve current static bytes. Mode 0 is the default textured path: preserved 0xffffffff is identity (the alpha byte is not tint strength). Mode 1 is SRCALPHA/ONE additive glow with ARGB alpha scaling the source contribution and RGB providing multiplicative modulation. Mode 2 conditionally forces ONE/ZERO for the selected render target and is used by 0x223 transition sources; mode 3 selects a subtractive special path. Surfaceless mode-0 fill consumption remains distinct.
+- **summary:** 0x203 (handle)(mode)(alpha)(color) — worker stores the D3D blend selector at obj+0x30 and STATIC packed color at obj+0x60; the handler's ctx+0x53d88 write is the generic 9-dword instruction length. Negative alpha/RGB preserve current static bytes. Mode 0 is the default textured path: preserved 0xffffffff is identity (the alpha byte is not tint strength). Its consumption is order-sensitive for FIELD's looping unit objects: a post-bind write supplies opacity to suppress/restore the idle object after its moving clone is made, while the prototype's pre-loop alpha-zero initialization remains opaque after DRAWCH binds the clone. Mode 1 is SRCALPHA/ONE additive glow with ARGB alpha scaling the source contribution and RGB providing multiplicative modulation. Mode 2 conditionally forces ONE/ZERO for the selected render target and is used by 0x223 transition sources; mode 3 selects a subtractive special path. Surfaceless mode-0 fill consumption remains distinct.
 - **grounding:** source=investigation, confidence=high
-- **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. Correct D3D9 constants at 0x4774c0 prove mode 1 writes SRCBLEND=5/SRCALPHA and DESTBLEND=2/ONE, not INVSRCALPHA. TITLE draws two opaque-black, no-colorkey SO022 flame sprites with mode 1; additive composition removes black and preserves the blue glow, verified in a windowed capture. Mode 2 transition setup and synchronized pixels prove 0xffffffff is identity, not solid white. SC0000 page 14 adds the mode-0 endpoint proof: after the EV052CA->EV052DA 0x223 crossfade, 0x203@0x12478 restores the base CG to mode 0 with preserved 0xffffffff; native keeps EV052DA visible while the port's tint-strength interpretation turns every texel white.
+- **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. Correct D3D9 constants at 0x4774c0 prove mode 1 writes SRCBLEND=5/SRCALPHA and DESTBLEND=2/ONE, not INVSRCALPHA. TITLE draws two opaque-black, no-colorkey SO022 flame sprites with mode 1; additive composition removes black and preserves the blue glow, verified in a windowed capture. Mode 2 transition setup and synchronized pixels prove 0xffffffff is identity, not solid white. SC0000 page 14 adds the mode-0 endpoint proof: after the EV052CA->EV052DA 0x223 crossfade, 0x203@0x12478 restores the base CG to mode 0 with preserved 0xffffffff; native keeps EV052DA visible while the port's tint-strength interpretation turns every texel white. FIELD's movement lifecycle clones idle handle 0x9c40+entity to temporary handle 0x9c40+0x76c, writes mode-0 alpha zero to the bound looping idle handle at 0x45dc/0x4699/0x5210, animates only the temporary handle, then DRAWCH rebinds the idle handle at the next tile. Rendering static mode-0 alpha as universally inert leaves the reported stationary ghost at every route segment.
 
 ### 0x205 `draw-formatted-integer` (u00420A60, argc 6)
 - **summary:** Format an integer into a fixed-width decimal field and rasterize it immediately into a numbered graphics surface using the current font/color/effect state.