crates/console/prometeu-firmware/src/firmware/firmware.rs

@@ -250,6 +250,7 @@ impl Firmware {
 mod tests {
     use super::*;
     use crate::firmware::firmware_state::HubHomeStep;
+    use crate::firmware::resident_game_termination::{self, ResidentGameTerminationOutcome};
     use prometeu_bytecode::assembler::assemble;
     use prometeu_bytecode::model::{BytecodeModule, FunctionMeta, SyscallDecl};
     use prometeu_drivers::{GlyphBankPoolAccess, SceneBankPoolAccess, TestPlatform};
@@ -258,6 +259,7 @@ mod tests {
     use prometeu_hal::asset::{BankType, SlotRef};
     use prometeu_hal::cartridge::AssetsPayloadSource;
     use prometeu_hal::color::Color;
+    use prometeu_hal::log::{LogLevel, LogSource};
     use prometeu_hal::primitives::Rect;
     use prometeu_hal::syscalls::{Syscall, caps};
     use prometeu_system::process::ProcessState;
@@ -988,6 +990,115 @@ mod tests {
         assert_eq!(stress_ownership.app_id, 1);
     }
 
+    #[test]
+    fn resident_game_termination_noops_when_no_game_is_resident() {
+        let (mut firmware, mut platform) = hub_home_firmware();
+        let ownership_before = firmware.os.vm().active_render_ownership();
+
+        let outcome = resident_game_termination::terminate_resident_game(
+            &mut firmware.os,
+            &mut platform,
+            true,
+        )
+        .expect("no resident game termination should not fail");
+
+        assert_eq!(outcome, ResidentGameTerminationOutcome::NoResidentGame);
+        assert_eq!(firmware.os.vm().active_render_ownership(), ownership_before);
+        assert_eq!(firmware.os.lifecycle().resident_game_task(), None);
+        assert!(
+            !firmware
+                .os
+                .recent_logs(16)
+                .iter()
+                .any(|event| event.msg.contains("Resident game killed from Hub"))
+        );
+    }
+
+    #[test]
+    fn resident_game_termination_closes_session_and_cleans_runtime_state() {
+        let library = discover_games_root(repository_test_cartridges_root());
+        let (mut firmware, mut platform) = hub_home_firmware();
+        firmware.hub.set_game_library(library);
+        firmware.tick(&InputSignals::default(), &mut platform);
+
+        let stress_click =
+            InputSignals { f_signal: true, x_pos: 72, y_pos: 118, ..Default::default() };
+        firmware.tick(&stress_click, &mut platform);
+        firmware.tick(&InputSignals::default(), &mut platform);
+
+        let stress_task = match &firmware.state {
+            FirmwareState::GameRunning(step) => step.task_id,
+            other => panic!("expected Stress GameRunning state, got {:?}", other),
+        };
+
+        firmware.request_home_from_host();
+        firmware.tick(&InputSignals::default(), &mut platform);
+
+        assert!(matches!(firmware.state, FirmwareState::HubHome(_)));
+        assert_eq!(firmware.os.lifecycle().resident_game_task(), Some(stress_task));
+        assert!(firmware.game_lifecycle_audio_paused());
+        assert_eq!(
+            platform.assets().slot_info(SlotRef { asset_type: BankType::GLYPH, index: 0 }).asset_id,
+            Some(100)
+        );
+        assert_eq!(
+            platform.assets().slot_info(SlotRef { asset_type: BankType::SCENE, index: 0 }).asset_id,
+            Some(1)
+        );
+        assert!(platform.local_hardware().memory_banks.glyph_bank_slot(0).is_some());
+        assert!(platform.local_hardware().memory_banks.scene_bank_slot(0).is_some());
+
+        let outcome = resident_game_termination::terminate_resident_game(
+            &mut firmware.os,
+            &mut platform,
+            true,
+        )
+        .expect("resident game termination should succeed");
+
+        assert_eq!(
+            outcome,
+            ResidentGameTerminationOutcome::Terminated {
+                task_id: stress_task,
+                title: "Stress Console".to_string()
+            }
+        );
+        assert_eq!(firmware.os.lifecycle().resident_game_task(), None);
+        assert_eq!(firmware.os.lifecycle().task_state(stress_task), Some(TaskState::Closed));
+        assert_eq!(
+            firmware.os.lifecycle().process_state_for_task(stress_task),
+            Ok(ProcessState::Stopped)
+        );
+        assert_eq!(
+            firmware.os.sessions().vm_session_for_task(stress_task).map(|session| session.task_id),
+            None
+        );
+        assert!(!firmware.game_lifecycle_audio_paused());
+
+        let ownership = firmware.os.vm().active_render_ownership();
+        assert_eq!(ownership.app_mode, AppMode::Shell);
+        assert_eq!(ownership.app_id, 0);
+        assert_eq!(platform.local_hardware().frame_composer.active_scene_id(), None);
+        assert_eq!(
+            platform.assets().slot_info(SlotRef { asset_type: BankType::GLYPH, index: 0 }).asset_id,
+            None
+        );
+        assert_eq!(
+            platform.assets().slot_info(SlotRef { asset_type: BankType::SCENE, index: 0 }).asset_id,
+            None
+        );
+        assert!(platform.local_hardware().memory_banks.glyph_bank_slot(0).is_none());
+        assert!(platform.local_hardware().memory_banks.scene_bank_slot(0).is_none());
+
+        assert!(
+            firmware.os.recent_logs(32).iter().any(|event| {
+                event.level == LogLevel::Info
+                    && event.source == LogSource::Hub
+                    && event.msg == "Resident game killed from Hub: Stress Console"
+            }),
+            "manual Hub kill should emit an INFO log"
+        );
+    }
+
     #[test]
     fn failed_game_switch_returns_home_without_restoring_previous_game() {
         let root = TestGameRoot::new();

crates/console/prometeu-firmware/src/firmware/firmware_step_hub_home.rs

@@ -2,6 +2,7 @@ use crate::firmware::firmware_state::{
     AppCrashesStep, FirmwareState, LoadCartridgeStep, ShellRunningStep,
 };
 use crate::firmware::prometeu_context::PrometeuContext;
+use crate::firmware::resident_game_termination;
 use prometeu_hal::app_mode::AppMode;
 use prometeu_hal::cartridge_loader::CartridgeLoader;
 use prometeu_hal::log::{LogLevel, LogSource};
@@ -69,7 +70,11 @@ impl HubHomeStep {
                                 return Some(FirmwareState::ResumeResidentGame);
                             }
 
-                            if let Err(error) = ctx.os.lifecycle().terminate_resident_game() {
+                            if let Err(error) = resident_game_termination::terminate_resident_game(
+                                ctx.os,
+                                ctx.platform,
+                                false,
+                            ) {
                                 ctx.os.log(
                                     LogLevel::Error,
                                     LogSource::Hub,

crates/console/prometeu-firmware/src/firmware/firmware_step_load_cartridge.rs

@@ -2,6 +2,7 @@ use crate::firmware::firmware_state::{
     AppCrashesStep, FirmwareState, GameRunningStep, HubHomeStep, ShellRunningStep,
 };
 use crate::firmware::prometeu_context::PrometeuContext;
+use crate::firmware::resident_game_termination;
 use prometeu_hal::app_mode::AppMode;
 use prometeu_hal::cartridge::Cartridge;
 use prometeu_hal::color::Color;
@@ -82,7 +83,11 @@ impl LoadCartridgeStep {
                         .unwrap_or(false);
 
                     if is_partial_target {
-                        let _ = ctx.os.lifecycle().terminate_resident_game();
+                        let _ = resident_game_termination::terminate_resident_game(
+                            ctx.os,
+                            ctx.platform,
+                            false,
+                        );
                     }
                 }
 

crates/console/prometeu-firmware/src/firmware/mod.rs

@@ -12,6 +12,7 @@ pub(crate) mod firmware_step_reset;
 pub(crate) mod firmware_step_shell_running;
 pub(crate) mod firmware_step_splash_screen;
 mod prometeu_context;
+pub(crate) mod resident_game_termination;
 
 pub use boot_target::BootTarget;
 pub use firmware::Firmware;

crates/console/prometeu-firmware/src/firmware/resident_game_termination.rs

@@ -0,0 +1,42 @@
+use prometeu_hal::RuntimePlatform;
+use prometeu_hal::app_mode::AppMode;
+use prometeu_hal::log::LogSource;
+use prometeu_system::task::TaskId;
+use prometeu_system::{LifecycleError, SystemOS};
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub(crate) enum ResidentGameTerminationOutcome {
+    NoResidentGame,
+    Terminated { task_id: TaskId, title: String },
+}
+
+pub(crate) fn terminate_resident_game(
+    os: &mut SystemOS,
+    platform: &mut dyn RuntimePlatform,
+    log_manual_hub_kill: bool,
+) -> Result<ResidentGameTerminationOutcome, LifecycleError> {
+    let Some(task_id) = os.lifecycle().resident_game_task() else {
+        return Ok(ResidentGameTerminationOutcome::NoResidentGame);
+    };
+
+    let title = os
+        .sessions()
+        .vm_session_for_task(task_id)
+        .map(|session| session.title.clone())
+        .unwrap_or_else(|| "<unknown>".to_string());
+
+    let terminated = os.lifecycle().terminate_resident_game()?;
+    let Some(task_id) = terminated else {
+        return Ok(ResidentGameTerminationOutcome::NoResidentGame);
+    };
+
+    os.vm().transition_render_owner(AppMode::Shell, 0);
+    platform.game2d_frame_composer().unbind_scene();
+    platform.assets_mut().shutdown();
+
+    if log_manual_hub_kill {
+        os.info(LogSource::Hub, format!("Resident game killed from Hub: {title}"));
+    }
+
+    Ok(ResidentGameTerminationOutcome::Terminated { task_id, title })
+}

discussion/index.ndjson

@@ -1,5 +1,5 @@
 {"type":"meta","next_id":{"DSC":45,"AGD":48,"DEC":41,"PLN":167,"LSN":53,"CLSN":1}}
-{"type":"discussion","id":"DSC-0044","status":"in_progress","ticket":"hub-suspended-game-kill-affordance","title":"Hub Suspended Game Kill Affordance","created_at":"2026-07-05","updated_at":"2026-07-05","tags":["hub","lifecycle","game","ui"],"agendas":[{"id":"AGD-0047","file":"AGD-0047-hub-suspended-game-kill-affordance.md","status":"accepted","created_at":"2026-07-05","updated_at":"2026-07-05"}],"decisions":[{"id":"DEC-0040","file":"DEC-0040-hub-suspended-game-kill-affordance.md","status":"accepted","created_at":"2026-07-05","updated_at":"2026-07-05","ref_agenda":"AGD-0047"}],"plans":[{"id":"PLN-0163","file":"PLN-0163-render-hub-suspended-game-kill-control.md","status":"open","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0040"]},{"id":"PLN-0164","file":"PLN-0164-expose-resident-game-termination-contract.md","status":"open","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0040"]},{"id":"PLN-0165","file":"PLN-0165-validate-hub-kill-flow-end-to-end.md","status":"open","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0040"]},{"id":"PLN-0166","file":"PLN-0166-publish-hub-kill-contract-spec-and-lesson-hooks.md","status":"open","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0040"]}],"lessons":[]}
+{"type":"discussion","id":"DSC-0044","status":"in_progress","ticket":"hub-suspended-game-kill-affordance","title":"Hub Suspended Game Kill Affordance","created_at":"2026-07-05","updated_at":"2026-07-05","tags":["hub","lifecycle","game","ui"],"agendas":[{"id":"AGD-0047","file":"AGD-0047-hub-suspended-game-kill-affordance.md","status":"accepted","created_at":"2026-07-05","updated_at":"2026-07-05"}],"decisions":[{"id":"DEC-0040","file":"DEC-0040-hub-suspended-game-kill-affordance.md","status":"accepted","created_at":"2026-07-05","updated_at":"2026-07-05","ref_agenda":"AGD-0047"}],"plans":[{"id":"PLN-0163","file":"PLN-0163-render-hub-suspended-game-kill-control.md","status":"open","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0040"]},{"id":"PLN-0164","file":"PLN-0164-expose-resident-game-termination-contract.md","status":"done","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0040"]},{"id":"PLN-0165","file":"PLN-0165-validate-hub-kill-flow-end-to-end.md","status":"open","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0040"]},{"id":"PLN-0166","file":"PLN-0166-publish-hub-kill-contract-spec-and-lesson-hooks.md","status":"open","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0040"]}],"lessons":[]}
 {"type":"discussion","id":"DSC-0043","status":"in_progress","ticket":"system-os-cartridge-switch-orchestrator","title":"SystemOS Cartridge Switch Orchestrator","created_at":"2026-07-03","updated_at":"2026-07-05","tags":["runtime","os","lifecycle","game","cartridge","architecture"],"agendas":[{"id":"AGD-0044","file":"AGD-0044-systemos-cartridge-switch-orchestrator.md","status":"accepted","created_at":"2026-07-03","updated_at":"2026-07-05"}],"decisions":[{"id":"DEC-0039","file":"DEC-0039-systemos-game-cartridge-switch-orchestrator.md","status":"accepted","created_at":"2026-07-05","updated_at":"2026-07-05","ref_agenda":"AGD-0044"}],"plans":[{"id":"PLN-0157","file":"PLN-0157-introduce-systemos-game-switch-target-contract.md","status":"done","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0039"]},{"id":"PLN-0158","file":"PLN-0158-terminate-resident-game-before-switching-cartridges.md","status":"done","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0039"]},{"id":"PLN-0159","file":"PLN-0159-recover-failed-game-switches-back-to-home.md","status":"done","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0039"]},{"id":"PLN-0160","file":"PLN-0160-add-dummy-boy-visual-switch-test-cartridge.md","status":"done","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0039"]},{"id":"PLN-0161","file":"PLN-0161-validate-stress-to-dummy-boy-game-switch-end-to-end.md","status":"done","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0039"]},{"id":"PLN-0162","file":"PLN-0162-specify-game-switch-contract-and-direct-boot-separation.md","status":"done","created_at":"2026-07-05","updated_at":"2026-07-05","ref_decisions":["DEC-0039"]}],"lessons":[]}
 {"type":"discussion","id":"DSC-0039","status":"abandoned","ticket":"render-pipeline-family-and-future-3d","title":"Render Pipeline Family and Future 3D","created_at":"2026-06-04","updated_at":"2026-06-04","tags":["gfx","renderer","runtime","architecture","pipeline"],"agendas":[{"id":"AGD-0039","file":"AGD-0039-render-pipeline-family-and-future-3d.md","status":"abandoned","created_at":"2026-06-04","updated_at":"2026-06-04","_override_reason":"User explicitly chose to close this agenda without a new decision because DSC-0038 already established enough architecture for future extension, and 3D is intentionally deferred."}],"decisions":[],"plans":[],"lessons":[],"_override_reason":"User explicitly chose to close this agenda without a new decision because DSC-0038 already established enough architecture for future extension, and 3D is intentionally deferred."}
 {"type":"discussion","id":"DSC-0040","status":"done","ticket":"vm-render-parallel-execution-boundary","title":"VM and Render Parallel Execution Boundary","created_at":"2026-06-04","updated_at":"2026-06-06","tags":["runtime","renderer","vm","concurrency","architecture","perf"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0048","file":"discussion/lessons/DSC-0040-vm-render-parallel-execution-boundary/LSN-0048-render-workers-need-a-closed-packet-contract.md","status":"done","created_at":"2026-06-06","updated_at":"2026-06-06"}]}

discussion/workflow/plans/PLN-0164-expose-resident-game-termination-contract.md

@@ -2,7 +2,7 @@
 id: PLN-0164
 ticket: hub-suspended-game-kill-affordance
 title: Expose Resident Game Termination Contract
-status: open
+status: done
 created: 2026-07-05
 ref_decisions: [DEC-0040]
 tags: [hub, lifecycle, game, ui]