fix: enable loading progress ticks, fix _field_4dc condition

- Enable DDGameWrapper__LoadingProgressTick calls (4 total) that were
disabled — these update wrapper+0x4D8/4DC/4E0 progress fields
- Fix _field_4dc condition: check net_game null (original checks
display null, but our headless display is non-null)
- Add DDGameWrapper shadow dump for comparison

Headful replay completes. Headless still has frame-0 checksum mismatch.
Wrapper fields 0x4D8/4DC/4E0 now closer to original.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/openwa-core/src/engine/ddgame.rs

@@ -1237,7 +1237,9 @@ unsafe fn init_graphics_and_resources(
 
     // ── DDGameWrapper field inits ──
     (*wrapper)._field_4d8 = 0;
-    if display.is_null() || net_game.is_null() {
+    // Original checks `display == NULL`, but our headless display is non-null.
+    // Use net_game null check as equivalent (net_game is null in headless/offline modes).
+    if net_game.is_null() {
         (*wrapper)._field_4dc = 0x2AD;
     } else {
         let byte_val = *net_game.add(0x44C) as u32;
@@ -1273,9 +1275,9 @@ unsafe fn init_graphics_and_resources(
 
     let _ = crate::log::log_line("[DDGame] past ActiveSoundTable");
 
-    // ── Loading tick: disabled (pumps message loop, causes crashes) ──
-    // call_usercall_ecx(wrapper, LOADING_PROGRESS_TICK_ADDR);
-    // call_usercall_ecx(wrapper, LOADING_PROGRESS_TICK_ADDR);
+    // ── Loading progress ticks (original calls DDGameWrapper__LoadingProgressTick twice here) ──
+    call_usercall_ecx(wrapper, LOADING_PROGRESS_TICK_ADDR);
+    call_usercall_ecx(wrapper, LOADING_PROGRESS_TICK_ADDR);
 
     // ── GfxResource: thiscall(ECX=gfx_handler) + EAX=name + 1 stack(output), RET 0x4 ──
     // Test: call GfxResource with real params
@@ -1540,9 +1542,9 @@ unsafe fn init_graphics_and_resources(
         // TODO: populate coord_list from landscape data (complex loop)
     }
 
-    // ── Loading tick: disabled (pumps message loop) ──
-    // call_usercall_ecx(wrapper, LOADING_PROGRESS_TICK_ADDR);
-    // call_usercall_ecx(wrapper, LOADING_PROGRESS_TICK_ADDR);
+    // ── Loading progress ticks (second pair, before sprite resource loading) ──
+    call_usercall_ecx(wrapper, LOADING_PROGRESS_TICK_ADDR);
+    call_usercall_ecx(wrapper, LOADING_PROGRESS_TICK_ADDR);
 
     // ── Sprite resource loading via DDGameWrapper vtable[0] ──
     // DDNetGameWrapper__LoadResourceList: thiscall(ECX=wrapper) +

crates/openwa-wormkit/src/replacements/game_session.rs

@@ -163,6 +163,29 @@ pub(crate) unsafe fn construct_ddgame_wrapper(
         ));
     }
 
+    // Dump DDGameWrapper state
+    if std::env::var("OPENWA_VALIDATE").is_ok() {
+        let wrapper_dwords = this as *const u32;
+        // DDGameWrapper is ~0x6EF0 bytes (from DDGameWrapper__Constructor at 0x56DEF0)
+        let w_count = 0x6EF0 / 4;
+        let mut w_nonzero = 0u32;
+        let _ = log_line("[Shadow:Wrapper] === DDGameWrapper ===");
+        for i in 0..w_count {
+            let val = *wrapper_dwords.add(i);
+            if val != 0 {
+                w_nonzero += 1;
+                if w_nonzero <= 200 {
+                    let _ = log_line(&format!(
+                        "[Shadow:Wrapper] +0x{:04X} = 0x{:08X}", i * 4, val,
+                    ));
+                }
+            }
+        }
+        let _ = log_line(&format!(
+            "[Shadow:Wrapper] Total non-zero: {} / {}", w_nonzero, w_count,
+        ));
+    }
+
     // Initialize DDGame's game-state fields.
     let _ = log_line("[GameSession] calling InitGameState");
     let init_state: unsafe extern "stdcall" fn(*mut DDGameWrapper) =