Fix retained background lifecycle

tools/age_opcodes_himegari.py

@@ -22,6 +22,7 @@ INFERRED: dict[int, dict] = {
     0x1f4: dict(name='stmt-begin', category='marker', noop=True, confidence='high', source='investigation', summary='zero-arg; opens scripts, pairs with stmt-end 0x1f5'),
     0x1f5: dict(name='stmt-end', category='marker', noop=True, confidence='high', source='investigation', summary='zero-arg; precedes exit/next-stmt, pairs with 0x1f4'),
     0x1fd: dict(name='gfx-set-scale-current', category='draw', noop=False, confidence='high', source='investigation', summary="(handle)(scale_x_percent)(scale_y_percent)(scale_z_percent) — immediately replace the retained object's current scale matrix at obj+0x6c. The handler divides each integer operand by 100.0 before calling matrix4_make_scale; this is distinct from 0x21e's delayed one-shot target scale."),
+    0x1ff: dict(name='set-current-translation', category='draw', noop=False, confidence='high', source='investigation', summary="0x1ff (handle)(x)(y)(z) — immediately replace the retained object's current translation matrix at obj+0x16c. This is the direct-current companion to 0x220's delayed target at obj+0x1ac."),
     0x21b: dict(name='line-id?', category='marker', noop=True, confidence='med', source='harness', summary='1 imm; mov->0x21b->stmt-end; near save/load-messkip — likely line/stmt id, verify not msg-control'),
     0x258: dict(name='decl?', category='marker', noop=True, confidence='low', source='harness', summary='2 imm; runs in a chain right after script-entry 0x259, enumerating ids — prologue declaration/registration?'),
     0x259: dict(name='script-entry', category='marker', noop=True, confidence='low', source='harness', summary='zero-arg; the first instruction of a script (offset 0), opens the decl chain that 0x258 continues — script/prologue entry marker, structural'),