[AGC] Quake rendering progress: WAIT_REG_MEM, draw fixes, VideoOut, and HLE improvements (#68)

* [agc] WAIT_REG_MEM suspend/resume, draw packet fixes, new HLE exports, debug cleanup

Rebased onto upstream 79a7437 (par274/sharpemu, rewritten history).

- GpuWaitRegistry: DCBs suspended on unsatisfied WAIT_REG_MEM are re-polled
  against guest memory on every submit; fixed 64-bit and standard packet parse
  offsets, apply the mask, treat PM4 compare function 0 as "always".
- TryReadSubmittedDrawCount: accept the 5-dword ItDrawIndex2 form emitted by
  DcbDrawIndex (count at +4); menu draws were silently discarded before.
- sceAgcDriverSubmitMultiDcbs: reversed ABI (rdi=address array, rsi=dword
  sizes, rdx=count).
- VideoOut: vblank events, sceVideoOutGetFlipStatus, buffers registered via
  sceVideoOutRegisterBuffers are valid flip targets.
- New HLE: libc stdio (fopen/fread/fseek/ftell/fclose/fgets), Dinkumware
  _Getpctype ctype table, NpTrophy2 stubs, AMPR PAK sequential-read tracker,
  MsgDialog lifecycle, NGS2 alt NIDs + dummy vtable for handle objects,
  guarded memset intrinsic, abort()/strcasecmp null-arg recovery.
- Removed investigation-only code (INT3 breakpoints, qfont/mcpp dumps,
  error-candidate printf traces, unconditional debug logs).

First rendered frame: Quake (PPSA01880) presents a 1920x1080 guest frame.

* Implemented a guarded native intrinsic (rep movsb) in DirectExecutionBackend to bypass HLE dispatch overhead, while preserving memory safety checks.

src/SharpEmu.Libs/AvPlayer/AvPlayerExports.cs

@@ -35,6 +35,42 @@ public static class AvPlayerExports
         return unchecked((int)handle);
     }
 
+    [SysAbiExport(
+        Nid = "JdksQu8pNdQ",
+        ExportName = "sceAvPlayerGetVideoDataEx",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceAvPlayer")]
+    public static int AvPlayerGetVideoDataEx(CpuContext ctx)
+    {
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    // "UbQoYawOsfY" is sceAvPlayerIsActive, not sceAvPlayerGetVideoDataEx (the previous NID here
+    // was wrong - verified by hashing both names against scripts/ps5_names.txt). No player is
+    // ever actually active in this HLE implementation, so report false/inactive.
+    [SysAbiExport(
+        Nid = "UbQoYawOsfY",
+        ExportName = "sceAvPlayerIsActive",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceAvPlayer")]
+    public static int AvPlayerIsActive(CpuContext ctx)
+    {
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+
+    [SysAbiExport(
+        Nid = "Wnp1OVcrZgk",
+        ExportName = "sceAvPlayerGetAudioData",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceAvPlayer")]
+    public static int AvPlayerGetAudioData(CpuContext ctx)
+    {
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
     [SysAbiExport(
         Nid = "HD1YKVU26-M",
         ExportName = "sceAvPlayerPostInit",