Implement ROOM fades and character voices

tools/age_opcodes_himegari.py

@@ -4,6 +4,9 @@
 from __future__ import annotations
 
 INFERRED: dict[int, dict] = {
+    0x25: dict(name='crossfade-surfaces', category='draw', noop=False, confidence='high', source='investigation', summary='(source_surface)(target_surface)(interval_argument) — blocking legacy full-frame mode-4 alpha transition. The native engine composites the captured target surface over the captured source while an 8-bit alpha accumulator advances from 0 to 256.'),
+    0x60: dict(name='random-modulo', category='compute', noop=False, confidence='high', source='investigation', summary="(destination)(bound) — write CRT rand() % bound. A bound of zero first writes zero and then raises the engine's script error."),
+    0x6c: dict(name='zero-int-range', category='compute', noop=False, confidence='high', source='investigation', summary='(destination)(count) — write logical integer zero to count consecutive VM cells beginning at the resolved destination.'),
     0x7b: dict(name='coroutine-save-yield-handlers', category='control', noop=False, confidence='high', source='investigation', summary='(handler1_pc)(handler2_pc) — scene-coroutine: save the two per-frame yield/resume handler PCs. Native writes op1→ctx[0x6da88+idx*4], op2→ctx[0x6db28+idx*4] (idx=ctx[0x53d14] script-context index); its generic handler prologue records the 5-dword instruction length. SC0000 0x79: `0x7b label_3c9 label_41e` registers the ADV per-frame render→poll→yield handlers. Part of the scene-coroutine framework (see engine-re.md §Scene-coroutine framework); pairs with 0x7c (resume) + 0x140 (loop iterator).'),
     0x7c: dict(name='coroutine-resume', category='control', noop=False, confidence='high', source='investigation', summary='() — scene-coroutine RESUME point. Native requires run-state bit 0x2000000 (ctx[0x6dbc8]) set — THROWS (__CxxThrowException) if unset, so it is only ever reached on a scheduler-driven re-entry, NEVER on a cold first pass (cold flow jmps over it). Restores PC=ctx[0x53d28]+ctx[0x6dbcc]*4, clears the run-bit (ctx+0xa0ce4 &= ~0x2000000), resets input/line state. SC0000 0x443 (falls into the main loop label_444). See engine-re.md §Scene-coroutine framework.'),
     0x86: dict(name='set-cursor-resource', category='input', noop=False, confidence='high', source='investigation', summary='(resource_id) - load an indexed cursor asset and install it as the active custom cursor.'),