fix: move CheckFileExistence gate NOPs to core file hooks

File_FindInArchive has two conditional jumps that skip calling
CheckFileExistence. Without NOPing them, preloadFileWithFlags
never reaches our hook and the game skips Bindings.xml loading
for embedded addons. This was previously only done by the
customassets module, so standalone variant DLLs (without
customassets) failed to load addon keybindings.

src/main.zig

@@ -604,10 +604,50 @@ fn installFileHooks() void {
     _ = cleanup_file_handle_hook.attach(0x648730, &cleanupFileHandleDetour);
     _ = model_load_hook.attach(0x71d4e0, &loadModelAsyncDetour);
     _ = cfe_hook.attach(0x654DD0, &checkFileExistenceDetour);
+    // NOP two gates in File_FindInArchive that prevent CheckFileExistence
+    // from running. Without this, preloadFileWithFlags never reaches our
+    // hook and the game skips Bindings.xml for embedded addons.
+    // (customassets also does this for loose files; the patches are idempotent.)
+    nopFileExistenceGates();
     log.print("in-memory file hooks installed\n");
 }
 
+// File_FindInArchive (0x6549a0) has two conditional jumps that skip the
+// call to CheckFileExistence (0x654DD0). NOP them so our hook always runs.
+var old_gate1: [2]u8 = undefined;
+var gate1_patched: bool = false;
+var old_gate2: [2]u8 = undefined;
+var gate2_patched: bool = false;
+
+fn nopFileExistenceGates() void {
+    const nops = [2]u8{ 0x90, 0x90 };
+    // Gate 1: JZ at 0x654b5c (74 25) -- skips CheckFileExistence
+    if (hook.readMem(u8, 0x654b5c) == 0x74 and hook.readMem(u8, 0x654b5d) == 0x25) {
+        old_gate1 = .{ 0x74, 0x25 };
+        hook.writeProtected(0x654b5c, &nops);
+        gate1_patched = true;
+    }
+    // Gate 2: JNZ at 0x654b6a (75 17) -- skips CheckFileExistence
+    if (hook.readMem(u8, 0x654b6a) == 0x75 and hook.readMem(u8, 0x654b6b) == 0x17) {
+        old_gate2 = .{ 0x75, 0x17 };
+        hook.writeProtected(0x654b6a, &nops);
+        gate2_patched = true;
+    }
+}
+
+fn revertFileExistenceGates() void {
+    if (gate1_patched) {
+        hook.writeProtected(0x654b5c, &old_gate1);
+        gate1_patched = false;
+    }
+    if (gate2_patched) {
+        hook.writeProtected(0x654b6a, &old_gate2);
+        gate2_patched = false;
+    }
+}
+
 fn removeFileHooks() void {
+    revertFileExistenceGates();
     cfe_hook.detach();
     model_load_hook.detach();
     process_async_hook.detach();