Implement History mouse wheel navigation

vm-map/engine-ctx.toml

@@ -33,6 +33,11 @@ name = "message_skip_enabled"
 type = "int"
 note = "persistent all-message Skip flag; op 0x88 writes it and adv_interpreter_tick injects input bit 0x40 while nonzero"
 [[field]]
+offset = 0x1c34
+name = "mouse_wheel_delta"
+type = "int"
+note = "signed WM_MOUSEWHEEL delta accumulated by age_main_window_proc; op 0x10d returns and clears it"
+[[field]]
 offset = 0x3028
 name = "alt_pack_table"
 type = "int"

vm-map/opcodes.toml

@@ -2463,18 +2463,18 @@ argc = 1
 abi_source = "kelebek+decode-validated"
 
 [opcode.semantics]
-name = "u00415F10"
-category = "unknown"
-summary = ""
+name = "consume-mouse-wheel-delta"
+category = "input"
+summary = "(out) - return the accumulated signed mouse-wheel delta and clear it."
 noop_headless = false
-source = "kelebek"
-confidence = "low"
+source = "investigation"
+confidence = "high"
 depends_on = []
-evidence = ""
+evidence = "Ghidra /v2: op_0x10d_consume_mouse_wheel_delta@0x428cf0 copies ctx+0x1c34 to operand 1 and immediately clears the field. AGE's window procedure at 0x486925 handles WM_MOUSEWHEEL by sign-extending the high word of wParam and accumulating it at ctx+0x1c34; HISTORY.BIN polls this value and branches on its sign to select one scroll direction."
 
 [[opcode.semantics.args]]
 i = 1
-role = ""
+role = "accumulated signed delta out"
 observed_types = ["l-int"]
 
 [[opcode]]