fix(runtime): preserve native mission outcome guards

crates/fparkan-runtime/src/lib.rs

@@ -49,13 +49,26 @@ impl EngineServices {
     }
 }
 
+/// Native mission mode used by the recovered host callback.
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum MissionMode {
+    /// Native application mode 1, used by the selected `missions/single.*` path.
+    SingleMission,
+    /// Native application mode 3, selected by the main-menu idle timer.
+    AutoDemo,
+}
+
 /// Mission request.
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct MissionRequest {
     /// Mission key/path.
     pub key: String,
+    /// Explicit host mode; this is not inferred from the mission path.
+    pub mode: MissionMode,
 }
 
+const INITIAL_SCRIPT_HOST_STATUS: u32 = 5;
+
 /// Ordered mission property preserved for later runtime stages.
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct MissionObjectProperty {
@@ -197,10 +210,11 @@ pub struct MissionScriptVarSetState {
     pub values: Vec<VarSetDefault>,
 }
 
-/// Rust-side outcome selected by the recovered `Iron3D` host-callback mapper.
+/// Rust-side outcome selected by the recovered `Iron3D` host callback.
 #[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
 pub enum MissionScriptOutcome {
-    /// No outcome has been recorded in the Rust model.
+    /// No host callback outcome has been recorded; this does not mean that the
+    /// native `IGame` has entered its running state.
     #[default]
     Active,
     /// Rust outcome corresponding to completion payload `1`.
@@ -218,7 +232,7 @@ pub enum MissionScriptHostEffect {
     MissionCompleted,
     /// The Rust outcome changed to failed.
     MissionFailed,
-    /// The Rust outcome already held this target state.
+    /// The native status guard rejected a repeated callback without changing state.
     NoChange,
 }
 
@@ -357,6 +371,8 @@ struct LoadedMissionState {
     script_varset: Option<MissionScriptVarSet>,
     script_init_states: Vec<MissionScriptInitState>,
     script_varset_states: Vec<MissionScriptVarSetState>,
+    script_host_mode: MissionMode,
+    script_host_status: u32,
     script_outcome: MissionScriptOutcome,
 }
 
@@ -899,6 +915,10 @@ fn load_mission_with_options(
         script_varset: loaded_scripts.varset,
         script_init_states: loaded_scripts.init_states,
         script_varset_states: loaded_scripts.varset_states,
+        script_host_mode: request.mode,
+        // Fresh IGame construction seeds this field with 5; this is not the
+        // later status-4 transition performed after native game initialization.
+        script_host_status: INITIAL_SCRIPT_HOST_STATUS,
         script_outcome: MissionScriptOutcome::Active,
     });
     Ok(summary)
@@ -997,8 +1017,9 @@ pub fn loaded_mission_script_varset_states(engine: &Engine) -> Option<&[MissionS
 ///
 /// Unlike the loader-only resolver, operands are read from the selected
 /// clan's instantiated varset cells. Dispatching the returned host callback
-/// remains separate from this function; the Rust outcome mapper does not model
-/// the native `IGame` guards or initial status word.
+/// remains separate from this function. The runtime currently models the
+/// callback's recovered mode and status guards, but not the full game startup
+/// transition or frame/event execution that reaches it.
 ///
 /// # Errors
 ///
@@ -1040,13 +1061,16 @@ pub fn loaded_mission_script_outcome(engine: &Engine) -> Option<MissionScriptOut
     engine.loaded.as_ref().map(|state| state.script_outcome)
 }
 
-/// Records the recovered `Iron3D` host-callback target in the Rust outcome.
+/// Applies the recovered `Iron3D` host-callback guards and records its outcome.
 ///
-/// `(mode=0, command=0, payload=0|1)` maps payload zero to failure and one to
-/// completion. Iron3D also checks the gate byte at `IGame + 0xe5` and the
-/// status word at `IGame + 8`; those native guards and the initial status are
-/// not represented here. Other callback commands return
-/// [`MissionScriptHostEffect::Unhandled`].
+/// Native mission mode `3` closes the callback gate. Otherwise the callback
+/// must have `(mode=0, command=0)` and payload `0` or `1`. Payload `0` writes
+/// status `1` and records failure only when the current status is not `1`;
+/// payload `1` writes status `0` and records completion only when the current
+/// status is not `0`. A duplicate returns [`MissionScriptHostEffect::NoChange`]
+/// without repairing any other state. Loaded mission state seeds the raw
+/// status from the native constructor value `5`; it does not model the later
+/// game-initialization transition to status `4`.
 ///
 /// # Errors
 ///
@@ -1063,31 +1087,36 @@ pub fn apply_loaded_script_host_callback(
             message: "mission script host state is unavailable".to_string(),
         })?;
     Ok(apply_recovered_script_host_callback(
+        state.script_host_mode,
+        &mut state.script_host_status,
         &mut state.script_outcome,
         command,
     ))
 }
 
 fn apply_recovered_script_host_callback(
+    native_mode: MissionMode,
+    status: &mut u32,
     outcome: &mut MissionScriptOutcome,
     command: VmHostCallbackCommand,
 ) -> MissionScriptHostEffect {
-    if command.mode != 0 || command.first != 0 {
+    if native_mode == MissionMode::AutoDemo || command.mode != 0 || command.first != 0 {
         return MissionScriptHostEffect::Unhandled;
     }
-    let next = match command.second {
-        0 => MissionScriptOutcome::Failed,
-        1 => MissionScriptOutcome::Completed,
-        _ => return MissionScriptHostEffect::Unhandled,
-    };
-    if *outcome == next {
-        return MissionScriptHostEffect::NoChange;
-    }
-    *outcome = next;
-    match next {
-        MissionScriptOutcome::Completed => MissionScriptHostEffect::MissionCompleted,
-        MissionScriptOutcome::Failed => MissionScriptHostEffect::MissionFailed,
-        MissionScriptOutcome::Active => MissionScriptHostEffect::Unhandled,
+    match command.second {
+        0 if *status != 1 => {
+            *status = 1;
+            *outcome = MissionScriptOutcome::Failed;
+            MissionScriptHostEffect::MissionFailed
+        }
+        0 => MissionScriptHostEffect::NoChange,
+        1 if *status != 0 => {
+            *status = 0;
+            *outcome = MissionScriptOutcome::Completed;
+            MissionScriptHostEffect::MissionCompleted
+        }
+        1 => MissionScriptHostEffect::NoChange,
+        _ => MissionScriptHostEffect::Unhandled,
     }
 }
 
@@ -1446,6 +1475,7 @@ mod tests {
             &mut engine,
             MissionRequest {
                 key: "MISSIONS/Autodemo.00/data.tma".to_string(),
+                mode: MissionMode::SingleMission,
             },
         )
         .expect_err("missing VFS");
@@ -1598,54 +1628,212 @@ mod tests {
     }
 
     #[test]
-    fn recovered_handler_thirty_host_callback_transitions_mission_outcome() {
+    fn handler_thirty_host_callback_obeys_native_mode_and_status_guards() {
+        fn command(second: u32) -> VmHostCallbackCommand {
+            VmHostCallbackCommand {
+                mode: 0,
+                first: 0,
+                second,
+            }
+        }
+
+        let mut status = 5;
         let mut outcome = MissionScriptOutcome::Active;
         assert_eq!(
             apply_recovered_script_host_callback(
+                MissionMode::SingleMission,
+                &mut status,
                 &mut outcome,
+                command(0),
+            ),
+            MissionScriptHostEffect::MissionFailed
+        );
+        assert_eq!((status, outcome), (1, MissionScriptOutcome::Failed));
+        outcome = MissionScriptOutcome::Completed;
+        assert_eq!(
+            apply_recovered_script_host_callback(
+                MissionMode::SingleMission,
+                &mut status,
+                &mut outcome,
+                command(0),
+            ),
+            MissionScriptHostEffect::NoChange
+        );
+        assert_eq!((status, outcome), (1, MissionScriptOutcome::Completed));
+        outcome = MissionScriptOutcome::Failed;
+
+        assert_eq!(
+            apply_recovered_script_host_callback(
+                MissionMode::SingleMission,
+                &mut status,
+                &mut outcome,
+                command(1),
+            ),
+            MissionScriptHostEffect::MissionCompleted
+        );
+        assert_eq!((status, outcome), (0, MissionScriptOutcome::Completed));
+        assert_eq!(
+            apply_recovered_script_host_callback(
+                MissionMode::SingleMission,
+                &mut status,
+                &mut outcome,
+                command(1),
+            ),
+            MissionScriptHostEffect::NoChange
+        );
+        assert_eq!((status, outcome), (0, MissionScriptOutcome::Completed));
+
+        assert_eq!(
+            apply_recovered_script_host_callback(
+                MissionMode::SingleMission,
+                &mut status,
+                &mut outcome,
+                command(0),
+            ),
+            MissionScriptHostEffect::MissionFailed
+        );
+        assert_eq!((status, outcome), (1, MissionScriptOutcome::Failed));
+
+        status = 4;
+        outcome = MissionScriptOutcome::Active;
+        assert_eq!(
+            apply_recovered_script_host_callback(
+                MissionMode::SingleMission,
+                &mut status,
+                &mut outcome,
+                command(1),
+            ),
+            MissionScriptHostEffect::MissionCompleted
+        );
+        assert_eq!((status, outcome), (0, MissionScriptOutcome::Completed));
+
+        status = 5;
+        outcome = MissionScriptOutcome::Active;
+        assert_eq!(
+            apply_recovered_script_host_callback(
+                MissionMode::AutoDemo,
+                &mut status,
+                &mut outcome,
+                command(0),
+            ),
+            MissionScriptHostEffect::Unhandled
+        );
+        assert_eq!((status, outcome), (5, MissionScriptOutcome::Active));
+
+        for command in [
+            VmHostCallbackCommand {
+                mode: 1,
+                first: 0,
+                second: 0,
+            },
+            VmHostCallbackCommand {
+                mode: 0,
+                first: 3,
+                second: 0,
+            },
+            VmHostCallbackCommand {
+                mode: 0,
+                first: 0,
+                second: 42,
+            },
+        ] {
+            assert_eq!(
+                apply_recovered_script_host_callback(
+                    MissionMode::SingleMission,
+                    &mut status,
+                    &mut outcome,
+                    command,
+                ),
+                MissionScriptHostEffect::Unhandled
+            );
+            assert_eq!((status, outcome), (5, MissionScriptOutcome::Active));
+        }
+    }
+
+    #[test]
+    #[ignore = "requires licensed corpus"]
+    fn loaded_host_callback_uses_requested_mode_and_constructor_status() {
+        let root = licensed_root("IS");
+        let vfs: Arc<dyn Vfs> = Arc::new(DirectoryVfs::new(root));
+        let key = "MISSIONS/Autodemo.00/data.tma".to_string();
+        let mut engine = create(EngineServices::new(vfs)).expect("engine");
+
+        load_mission_static_preview_roots(
+            &mut engine,
+            MissionRequest {
+                key: key.clone(),
+                mode: MissionMode::SingleMission,
+            },
+            NonZeroUsize::new(1).expect("non-zero root count"),
+        )
+        .expect("load single-mission preview");
+        let state = engine.loaded.as_mut().expect("loaded state");
+        assert_eq!(state.script_host_status, INITIAL_SCRIPT_HOST_STATUS);
+        assert_eq!(state.script_outcome, MissionScriptOutcome::Active);
+        assert_eq!(
+            apply_loaded_script_host_callback(
+                &mut engine,
                 VmHostCallbackCommand {
                     mode: 0,
                     first: 0,
                     second: 0,
                 },
-            ),
+            )
+            .expect("apply failure callback"),
             MissionScriptHostEffect::MissionFailed
         );
-        assert_eq!(outcome, MissionScriptOutcome::Failed);
+        assert_eq!(engine.loaded.as_ref().unwrap().script_host_status, 1);
         assert_eq!(
-            apply_recovered_script_host_callback(
-                &mut outcome,
-                VmHostCallbackCommand {
-                    mode: 0,
-                    first: 0,
-                    second: 1,
-                },
-            ),
-            MissionScriptHostEffect::MissionCompleted
+            loaded_mission_script_outcome(&engine),
+            Some(MissionScriptOutcome::Failed)
         );
-        assert_eq!(outcome, MissionScriptOutcome::Completed);
+
+        engine.loaded.as_mut().unwrap().script_outcome = MissionScriptOutcome::Completed;
         assert_eq!(
-            apply_recovered_script_host_callback(
-                &mut outcome,
+            apply_loaded_script_host_callback(
+                &mut engine,
                 VmHostCallbackCommand {
                     mode: 0,
                     first: 0,
-                    second: 1,
+                    second: 0,
                 },
-            ),
+            )
+            .expect("apply repeated failure callback"),
             MissionScriptHostEffect::NoChange
         );
+        assert_eq!(engine.loaded.as_ref().unwrap().script_host_status, 1);
         assert_eq!(
-            apply_recovered_script_host_callback(
-                &mut outcome,
+            loaded_mission_script_outcome(&engine),
+            Some(MissionScriptOutcome::Completed)
+        );
+
+        load_mission_static_preview_roots(
+            &mut engine,
+            MissionRequest {
+                key,
+                mode: MissionMode::AutoDemo,
+            },
+            NonZeroUsize::new(1).expect("non-zero root count"),
+        )
+        .expect("reload AutoDemo preview");
+        assert_eq!(engine.loaded.as_ref().unwrap().script_host_status, 5);
+        assert_eq!(
+            apply_loaded_script_host_callback(
+                &mut engine,
                 VmHostCallbackCommand {
                     mode: 0,
-                    first: 3,
-                    second: 42,
+                    first: 0,
+                    second: 1,
                 },
-            ),
+            )
+            .expect("apply AutoDemo callback"),
             MissionScriptHostEffect::Unhandled
         );
+        assert_eq!(engine.loaded.as_ref().unwrap().script_host_status, 5);
+        assert_eq!(
+            loaded_mission_script_outcome(&engine),
+            Some(MissionScriptOutcome::Active)
+        );
     }
 
     #[test]
@@ -1676,6 +1864,7 @@ mod tests {
             &mut engine,
             MissionRequest {
                 key: "MISSIONS/Autodemo.00/data.tma".to_string(),
+                mode: MissionMode::SingleMission,
             },
         )
         .expect("load mission");
@@ -1732,12 +1921,14 @@ mod tests {
                 DenyRule::Suffix("Land.map"),
                 MissionRequest {
                     key: "MISSIONS/Autodemo.00/data.tma".to_string(),
+                    mode: MissionMode::SingleMission,
                 },
             ),
             (
                 DenyRule::Suffix("objects.rlb"),
                 MissionRequest {
                     key: "MISSIONS/CAMPAIGN/CAMPAIGN.00/Mission.01/data.tma".to_string(),
+                    mode: MissionMode::SingleMission,
                 },
             ),
         ] {
@@ -1773,6 +1964,7 @@ mod tests {
             &mut engine,
             MissionRequest {
                 key: "MISSIONS/CAMPAIGN/CAMPAIGN.00/Mission.01/data.tma".to_string(),
+                mode: MissionMode::SingleMission,
             },
             MissionLoadOptions {
                 fail_after_registered_objects: Some(1),
@@ -1842,6 +2034,7 @@ mod tests {
                 &mut engine,
                 MissionRequest {
                     key: case.1.to_string(),
+                    mode: MissionMode::SingleMission,
                 },
             )
             .expect("load mission");
@@ -1954,6 +2147,7 @@ mod tests {
             &mut engine,
             MissionRequest {
                 key: case.mission.to_string(),
+                mode: MissionMode::SingleMission,
             },
         )
         .expect("load selected mission");
@@ -1978,8 +2172,14 @@ mod tests {
         let mut totals = LoadTotals::default();
         for mission in missions {
             let mut engine = create(EngineServices::new(vfs.clone())).expect("engine");
-            let loaded = load_mission(&mut engine, MissionRequest { key: mission })
-                .expect("load mission foundation");
+            let loaded = load_mission(
+                &mut engine,
+                MissionRequest {
+                    key: mission,
+                    mode: MissionMode::SingleMission,
+                },
+            )
+            .expect("load mission foundation");
             assert_eq!(loaded.object_count, loaded.registered_objects);
             assert_eq!(loaded.object_count, loaded.graph_root_count);
             assert_eq!(

crates/fparkan-runtime/tests/original_host_callback_oracle.cs

@@ -0,0 +1,185 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Security.Cryptography;
+using System.Text;
+
+internal static class HostCallbackOracle {
+    private const uint LoadWithAlteredSearchPath = 0x00000008;
+    private const uint MemCommitReserve = 0x00003000;
+    private const uint PageExecuteReadWrite = 0x40;
+    private const int CallbackRva = 0x611d0;
+    private const int GameGlobalRva = 0x10a5f8;
+    private const int SoundServerIatRva = 0xe42cc;
+    private const string ExpectedSha256 = "d1dc4ea8535e2069b0a05c9e8be2724dd438ba44cca7a83007d8b2e50f9e35fa";
+
+    [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+    private static extern IntPtr LoadLibraryEx(string fileName, IntPtr file, uint flags);
+    [DllImport("kernel32.dll", SetLastError = true)] private static extern bool FreeLibrary(IntPtr module);
+    [DllImport("kernel32.dll", SetLastError = true)] private static extern IntPtr VirtualAlloc(IntPtr address, UIntPtr size, uint allocationType, uint protect);
+    [DllImport("kernel32.dll", SetLastError = true)] private static extern bool VirtualFree(IntPtr address, UIntPtr size, uint freeType);
+    [DllImport("kernel32.dll", SetLastError = true)] private static extern bool VirtualProtect(IntPtr address, UIntPtr size, uint newProtect, out uint oldProtect);
+
+    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+    private delegate int HostCallback(int gameMode, int command, int payload);
+
+    private static int Main() {
+        if (IntPtr.Size != 4) { Console.Error.WriteLine("Build with /platform:x86."); return 2; }
+        string dllPath = Environment.GetEnvironmentVariable("FPARKAN_ORIGINAL_IRON3D_DLL");
+        if (String.IsNullOrEmpty(dllPath) || !File.Exists(dllPath)) {
+            Console.Error.WriteLine("Set FPARKAN_ORIGINAL_IRON3D_DLL to the original GOG iron3d.dll."); return 3;
+        }
+        string hash;
+        using (SHA256 sha = SHA256.Create()) using (FileStream input = File.OpenRead(dllPath)) {
+            byte[] digest = sha.ComputeHash(input); StringBuilder hex = new StringBuilder();
+            foreach (byte value in digest) hex.Append(value.ToString("x2")); hash = hex.ToString();
+        }
+        if (hash != ExpectedSha256) { Console.Error.WriteLine("Unexpected iron3d.dll SHA-256: " + hash); return 4; }
+        IntPtr module = LoadLibraryEx(dllPath, IntPtr.Zero, LoadWithAlteredSearchPath);
+        if (module == IntPtr.Zero) { Console.Error.WriteLine("LoadLibraryEx failed: " + Marshal.GetLastWin32Error()); return 5; }
+
+        IntPtr game = IntPtr.Zero, app = IntPtr.Zero, manager = IntPtr.Zero, sound = IntPtr.Zero, vtable = IntPtr.Zero;
+        IntPtr callStub = IntPtr.Zero, returnStub = IntPtr.Zero;
+        IntPtr gameGlobal = IntPtr.Zero; int originalGameGlobal = 0; bool gameGlobalPatched = false;
+        uint oldProtect = 0; bool iatPatched = false; int originalSoundPointer = 0;
+        try {
+            game = Marshal.AllocHGlobal(0x200); app = Marshal.AllocHGlobal(0x200); manager = Marshal.AllocHGlobal(0x40);
+            sound = Marshal.AllocHGlobal(4); vtable = Marshal.AllocHGlobal(0x14);
+            IntPtr observations = Marshal.AllocHGlobal(56);
+            try {
+                Zero(game, 0x200); Zero(app, 0x200); Zero(manager, 0x40); Zero(sound, 4); Zero(vtable, 0x14); Zero(observations, 56);
+                Marshal.WriteInt32(game, 4, app.ToInt32()); Marshal.WriteInt32(game, 0x2c, manager.ToInt32());
+                Marshal.WriteInt32(manager, 0x10, IntPtr.Zero.ToInt32());
+                Marshal.WriteInt32(sound, vtable.ToInt32());
+                IntPtr codePage = VirtualAlloc(IntPtr.Zero, new UIntPtr(0x1000), MemCommitReserve, PageExecuteReadWrite);
+                if (codePage == IntPtr.Zero) throw new InvalidOperationException("VirtualAlloc failed: " + Marshal.GetLastWin32Error());
+                callStub = codePage;
+                byte[] soundMethod = BuildSoundMethod(observations, game, app);
+                Marshal.Copy(soundMethod, 0, callStub, soundMethod.Length);
+                Marshal.WriteInt32(vtable, 0x10, callStub.ToInt32());
+                returnStub = IntPtr.Add(codePage, 0x100);
+                byte[] returnCode = { 0xb8, 0, 0, 0, 0, 0xc3 };
+                WriteImm32(returnCode, 1, sound.ToInt32()); Marshal.Copy(returnCode, 0, returnStub, returnCode.Length);
+
+                IntPtr iat = IntPtr.Add(module, SoundServerIatRva);
+                originalSoundPointer = Marshal.ReadInt32(iat);
+                if (!VirtualProtect(iat, new UIntPtr(4), PageExecuteReadWrite, out oldProtect))
+                    throw new InvalidOperationException("VirtualProtect(IAT) failed: " + Marshal.GetLastWin32Error());
+                Marshal.WriteInt32(iat, returnStub.ToInt32());
+                iatPatched = true;
+                uint ignored;
+                if (!VirtualProtect(iat, new UIntPtr(4), oldProtect, out ignored))
+                    throw new InvalidOperationException("VirtualProtect(IAT restore protection) failed: " + Marshal.GetLastWin32Error());
+
+                gameGlobal = IntPtr.Add(module, GameGlobalRva);
+                originalGameGlobal = Marshal.ReadInt32(gameGlobal);
+                Marshal.WriteInt32(gameGlobal, game.ToInt32());
+                gameGlobalPatched = true;
+                var callback = (HostCallback)Marshal.GetDelegateForFunctionPointer(IntPtr.Add(module, CallbackRva), typeof(HostCallback));
+                RunAllowedFailure(callback, game, app, observations);
+                RunFailureRepeat(callback, game, app, observations);
+                RunOppositeCompletion(callback, game, app, observations);
+                RunCompletionRepeat(callback, game, app, observations);
+                RunFailureAfterCompletion(callback, game, app, observations);
+                RunAutoDemoGate(callback, game, app, observations);
+                RunNonZeroGameMode(callback, game, app, observations);
+                RunUnknownPayload(callback, game, app, observations);
+                Console.WriteLine("native callback oracle passed; audio endpoint is an isolated no-op recorder");
+                return 0;
+            }
+            finally { Marshal.FreeHGlobal(observations); }
+        }
+        finally {
+            if (gameGlobalPatched) Marshal.WriteInt32(gameGlobal, originalGameGlobal);
+            if (iatPatched) {
+                IntPtr iat = IntPtr.Add(module, SoundServerIatRva); uint restore;
+                if (!VirtualProtect(iat, new UIntPtr(4), PageExecuteReadWrite, out restore))
+                    throw new InvalidOperationException("VirtualProtect(IAT cleanup) failed: " + Marshal.GetLastWin32Error());
+                Marshal.WriteInt32(iat, originalSoundPointer);
+                uint ignored;
+                if (!VirtualProtect(iat, new UIntPtr(4), restore, out ignored))
+                    throw new InvalidOperationException("VirtualProtect(IAT cleanup restore protection) failed: " + Marshal.GetLastWin32Error());
+            }
+            if (callStub != IntPtr.Zero) VirtualFree(callStub, UIntPtr.Zero, 0x8000);
+            if (vtable != IntPtr.Zero) Marshal.FreeHGlobal(vtable);
+            if (sound != IntPtr.Zero) Marshal.FreeHGlobal(sound);
+            if (manager != IntPtr.Zero) Marshal.FreeHGlobal(manager);
+            if (app != IntPtr.Zero) Marshal.FreeHGlobal(app);
+            FreeLibrary(module);
+            if (game != IntPtr.Zero) Marshal.FreeHGlobal(game);
+        }
+    }
+
+    private static byte[] BuildSoundMethod(IntPtr observations, IntPtr game, IntPtr app) {
+        var code = new List<byte>();
+        code.AddRange(new byte[] { 0x50, 0x52, 0x51, 0x56, 0x57 });
+        code.Add(0xa1); AddImm32(code, observations.ToInt32()); code.Add(0x40); code.Add(0xa3); AddImm32(code, observations.ToInt32());
+        code.AddRange(new byte[] { 0x8b, 0x74, 0x24, 0x18, 0x8b, 0x06, 0x8b, 0x56, 0x04, 0x2b, 0xd0, 0x89, 0x15 }); AddImm32(code, observations.ToInt32() + 4);
+        code.AddRange(new byte[] { 0x83, 0xfa, 0x17, 0x76, 0x09, 0xc6, 0x05 }); AddImm32(code, observations.ToInt32() + 48);
+        code.AddRange(new byte[] { 0x01, 0xeb, 0x0f, 0xbf }); AddImm32(code, observations.ToInt32() + 12);
+        code.AddRange(new byte[] { 0x8b, 0xca, 0x8b, 0xf0, 0xfc, 0xf3, 0xa4, 0xc6, 0x07, 0x00 });
+        code.AddRange(new byte[] { 0x8b, 0x44, 0x24, 0x1c, 0xa3 }); AddImm32(code, observations.ToInt32() + 8);
+        code.Add(0xb8); AddImm32(code, game.ToInt32());
+        code.AddRange(new byte[] { 0x8b, 0x40, 0x08, 0xa3 }); AddImm32(code, observations.ToInt32() + 40);
+        code.Add(0xb8); AddImm32(code, app.ToInt32());
+        code.AddRange(new byte[] { 0x0f, 0xb6, 0x80, 0x57, 0x01, 0x00, 0x00, 0xa3 }); AddImm32(code, observations.ToInt32() + 44);
+        code.AddRange(new byte[] { 0x5f, 0x5e, 0x59, 0x5a, 0x58, 0xc2, 0x08, 0x00 });
+        return code.ToArray();
+    }
+
+    private static void RunAllowedFailure(HostCallback callback, IntPtr game, IntPtr app, IntPtr obs) {
+        Setup(game, app, obs, 0, 5, 0x7f); int result = callback(0, 0, 0);
+        Expect(result == 1 && Marshal.ReadInt32(game, 8) == 1 && Marshal.ReadByte(app, 0x157) == 0, "failure state writes");
+        Expect(Marshal.ReadInt32(obs, 0) == 1 && Marshal.ReadInt32(obs, 40) == 5 && Marshal.ReadInt32(obs, 44) == 0x7f, "failure sound before writes");
+        Console.WriteLine("fail: status=1 mission_flag=0 sound={0}", SoundId(obs));
+        Expect(SoundId(obs) == "VOICE_MISSION_FAIL" && Marshal.ReadInt32(obs, 8) == 0, "failure voice id and argument");
+    }
+    private static void RunFailureRepeat(HostCallback callback, IntPtr game, IntPtr app, IntPtr obs) {
+        Marshal.WriteByte(app, 0x157, 0x7f);
+        int result = callback(0, 0, 0);
+        Expect(result == 1 && Marshal.ReadInt32(game, 8) == 1 && Marshal.ReadByte(app, 0x157) == 0x7f && Marshal.ReadInt32(obs, 0) == 1, "repeat failure preserves mismatched mission flag");
+    }
+    private static void RunOppositeCompletion(HostCallback callback, IntPtr game, IntPtr app, IntPtr obs) {
+        int result = callback(0, 0, 1); Expect(result == 1 && Marshal.ReadInt32(game, 8) == 0 && Marshal.ReadByte(app, 0x157) == 1 && Marshal.ReadInt32(obs, 0) == 2, "completion after failure");
+        Expect(Marshal.ReadInt32(obs, 40) == 1 && Marshal.ReadInt32(obs, 44) == 0x7f && SoundId(obs) == "VOICE_MISSION_COMPLETE" && Marshal.ReadInt32(obs, 8) == 0, "completion sound before writes");
+    }
+    private static void RunCompletionRepeat(HostCallback callback, IntPtr game, IntPtr app, IntPtr obs) {
+        Marshal.WriteByte(app, 0x157, 0x7f);
+        int result = callback(0, 0, 1);
+        Expect(result == 1 && Marshal.ReadInt32(game, 8) == 0 && Marshal.ReadByte(app, 0x157) == 0x7f && Marshal.ReadInt32(obs, 0) == 2, "repeat completion preserves mismatched mission flag");
+    }
+    private static void RunFailureAfterCompletion(HostCallback callback, IntPtr game, IntPtr app, IntPtr obs) {
+        int result = callback(0, 0, 0);
+        Expect(result == 1 && Marshal.ReadInt32(game, 8) == 1 && Marshal.ReadByte(app, 0x157) == 0 && Marshal.ReadInt32(obs, 0) == 3, "failure after completion");
+        Expect(Marshal.ReadInt32(obs, 40) == 0 && Marshal.ReadInt32(obs, 44) == 0x7f && SoundId(obs) == "VOICE_MISSION_FAIL" && Marshal.ReadInt32(obs, 8) == 0, "reverse transition sound before writes");
+        Console.WriteLine("fail-after-complete: status=1 mission_flag=0 sound={0}", SoundId(obs));
+    }
+    private static void RunAutoDemoGate(HostCallback callback, IntPtr game, IntPtr app, IntPtr obs) {
+        Setup(game, app, obs, 1, 5, 0x7f); callback(0, 0, 0);
+        Expect(Marshal.ReadInt32(game, 8) == 5 && Marshal.ReadByte(app, 0x157) == 0x7f && Marshal.ReadInt32(obs, 0) == 0, "AutoDemo gate suppresses callback");
+    }
+    private static void RunNonZeroGameMode(HostCallback callback, IntPtr game, IntPtr app, IntPtr obs) {
+        Setup(game, app, obs, 0, 5, 0x7f); callback(1, 0, 0);
+        Expect(Marshal.ReadInt32(game, 8) == 5 && Marshal.ReadByte(app, 0x157) == 0x7f && Marshal.ReadInt32(obs, 0) == 0, "nonzero callback mode suppressed");
+    }
+    private static void RunUnknownPayload(HostCallback callback, IntPtr game, IntPtr app, IntPtr obs) {
+        Setup(game, app, obs, 0, 5, 0x7f); callback(0, 0, 2);
+        Expect(Marshal.ReadInt32(game, 8) == 5 && Marshal.ReadByte(app, 0x157) == 0x7f && Marshal.ReadInt32(obs, 0) == 0, "unknown payload suppressed");
+    }
+    private static void Setup(IntPtr game, IntPtr app, IntPtr obs, byte gate, int status, byte missionFlag) {
+        Marshal.WriteByte(game, 0xe5, gate); Marshal.WriteInt32(game, 8, status); Marshal.WriteByte(app, 0x157, missionFlag);
+        Zero(obs, 56);
+    }
+    private static void Expect(bool value, string description) { if (!value) throw new InvalidOperationException("native oracle assertion failed: " + description); }
+    private static string SoundId(IntPtr observations) {
+        int length = Marshal.ReadInt32(observations, 4);
+        if (Marshal.ReadByte(observations, 48) != 0) throw new InvalidOperationException("native sound identifier exceeded recorder capacity");
+        if (length < 0 || length > 23) throw new InvalidOperationException("unexpected sound identifier length: " + length);
+        byte[] bytes = new byte[length]; Marshal.Copy(IntPtr.Add(observations, 12), bytes, 0, length);
+        return Encoding.ASCII.GetString(bytes);
+    }
+    private static void Zero(IntPtr buffer, int length) { for (int offset = 0; offset < length; offset++) Marshal.WriteByte(buffer, offset, 0); }
+    private static void AddImm32(List<byte> code, int value) { byte[] bytes = BitConverter.GetBytes(value); code.AddRange(bytes); }
+    private static void WriteImm32(byte[] bytes, int offset, int value) { byte[] immediate = BitConverter.GetBytes(value); Buffer.BlockCopy(immediate, 0, bytes, offset, 4); }
+}