feat(decomp): main lane m23 — 3 banked

One clean whole-EXE rebuild verified the batch (gate_main), and main re-checked
BYTE-IDENTICAL against config/check.us.sha before anything was credited.

  func_800111BC
  func_80028DBC
  func_800495EC

src/800.c

@@ -12664,7 +12664,11 @@ INCLUDE_ASM("asm/nonmatchings/800", func_80028D78);
 
 INCLUDE_ASM("asm/nonmatchings/800", func_80028D9C);
 
-INCLUDE_ASM("asm/nonmatchings/800", func_80028DBC);
+extern void func_80029124(s32, s32);
+
+void func_80028DBC(s32 a0) {
+    func_80029124(0xC, a0 & 0xFF);
+}
 
 INCLUDE_ASM("asm/nonmatchings/800", func_80028DE0);
 

src/800b_3.c

@@ -1,3 +1,22 @@
 #include "common.h"
 
-INCLUDE_ASM("asm/nonmatchings/800b_3", func_800495EC);
+
+/* func_800495EC -- handwritten GTE SXY-load entry (splat: Handwritten function).
+ * Three mtc2 stores of the incoming $a0-$a2 words into cop2 regs SXY0/SXY2/SXY1,
+ * then TWO bare nops and NO jr: control falls through into func_80049600
+ * (nclip + mfc2 $v0,$24 + jr $ra) in the next object. Any C function definition
+ * would emit a jr $ra epilogue the target does not have, so the body is
+ * transcribed verbatim as a file-scope asm block (cookbook §265 lane 1;
+ * SetSZfifo3 form @ src/gsgap5.c:54). Decimal immediates only (maspsx).
+ * Recovered semantics: gte_ldsxy3(a0,a1,a2); gte_nclip(); return gte_stMAC0();
+ * via the fallthrough. */
+__asm__(".text\n.align 2\n.globl func_800495EC\n.ent\tfunc_800495EC\n"
+        "func_800495EC:\n"
+        ".set\tnoreorder\n"
+        "mtc2 $4, $12\n"
+        "mtc2 $6, $14\n"
+        "mtc2 $5, $13\n"
+        "nop\n"
+        "nop\n"
+        ".set\treorder\n"
+        ".end\tfunc_800495EC\n");

src/boot.c

@@ -341,7 +341,18 @@ void DebugMenuHandler(void) {
     (void)iVar1;
 }
 
-INCLUDE_ASM("asm/nonmatchings/boot", func_800111BC);
+extern u8 D_800AF630[];
+extern void func_800CEE74(void);
+extern void func_80011818(s32);
+
+void func_800111BC(void) {
+    register u8 *p = D_800AF630;
+
+    func_800CEE74();
+    if (*(u16 *)(p + 0xA3B6) != 0) {
+        func_80011818(0xA);
+    }
+}
 
 INCLUDE_ASM("asm/nonmatchings/boot", func_80011220);