gamer147 08b5dbdbb6 feat(gfx): Godot per-object alpha tween + alpha-aware blit + --shot-settle ...

Retained-object animation channel wired into the compositor: wall-clock tween of
the anim channel over the GLOBAL clock (0x238), opacity from the 3rd vec component,
applied via an alpha-aware BlitLayer. Non-regressing (SC0000 opening page 2 pixel-
identical at settle 3 and 300; selftest OK). Added --shot-settle <frames> to capture
mid-tween.

NOTE: this drives RETAINED-object animations; the opening AE* explosion (AE001D/
AE002B/AE003B) is an immediate-mode slot-0 frame sequence paced by sleep/the render
loop, which our instant execution burst collapses -> needs frame-pacing (scene-
coroutine backlog), not this per-object channel.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-07 23:48:23 -04:00

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