implements PLN-0095

crates/console/prometeu-system/src/services/vm_runtime/lifecycle.rs

@@ -23,6 +23,7 @@ impl VirtualMachineRuntime {
             current_cartridge_app_version: String::new(),
             current_cartridge_app_mode: AppMode::Game,
             frame_scheduler: FrameScheduler::default(),
+            render_capabilities: RenderRuntimeCapabilities::default(),
             render_manager: RenderManager::new(AppMode::Game),
             gfx2d_commands: Vec::new(),
             gfxui_commands: Vec::new(),
@@ -121,6 +122,7 @@ impl VirtualMachineRuntime {
         self.current_cartridge_app_version.clear();
         self.current_cartridge_app_mode = AppMode::Game;
         self.frame_scheduler = FrameScheduler::default();
+        self.render_capabilities = RenderRuntimeCapabilities::default();
         self.render_manager = RenderManager::new(AppMode::Game);
         self.gfx2d_commands.clear();
         self.gfxui_commands.clear();
@@ -141,6 +143,10 @@ impl VirtualMachineRuntime {
         self.clear_cartridge_state();
     }
 
+    pub fn set_render_runtime_capabilities(&mut self, capabilities: RenderRuntimeCapabilities) {
+        self.render_capabilities = capabilities;
+    }
+
     pub fn initialize_vm(
         &mut self,
         log_service: &mut LogService,

crates/console/prometeu-system/src/services/vm_runtime/mod.rs

@@ -14,7 +14,7 @@ use prometeu_hal::log::LogService;
 use prometeu_hal::telemetry::{AtomicTelemetry, CertificationConfig, Certifier};
 use prometeu_hal::{Gfx2dCommand, GfxUiCommand};
 use prometeu_vm::VirtualMachine;
-pub use render_manager::RenderManager;
+pub use render_manager::{RenderManager, RenderRuntimeCapabilities};
 use std::collections::HashMap;
 use std::sync::Arc;
 use std::sync::atomic::AtomicU32;
@@ -31,6 +31,7 @@ pub struct VirtualMachineRuntime {
     pub current_cartridge_app_version: String,
     pub current_cartridge_app_mode: AppMode,
     pub frame_scheduler: FrameScheduler,
+    pub render_capabilities: RenderRuntimeCapabilities,
     pub render_manager: RenderManager,
     pub gfx2d_commands: Vec<Gfx2dCommand>,
     pub gfxui_commands: Vec<GfxUiCommand>,

crates/console/prometeu-system/src/services/vm_runtime/render_manager.rs

@@ -29,6 +29,17 @@ pub enum RenderExecutionPolicy {
     WorkerCapableWithLocalFallback,
 }
 
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
+pub struct RenderRuntimeCapabilities {
+    pub game_render_worker: bool,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum RenderConsumerPath {
+    LocalSynchronous,
+    LocalWorkerPrototype,
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct RenderPolicy {
     pub app_mode: AppMode,
@@ -55,12 +66,37 @@ impl RenderPolicy {
     pub const fn uses_frame_scheduler(self) -> bool {
         matches!(self.pacing, RenderPacingPolicy::FrameScheduled)
     }
+
+    pub const fn resolve_consumer_path(
+        self,
+        capabilities: RenderRuntimeCapabilities,
+    ) -> RenderConsumerPath {
+        match (self.execution, capabilities.game_render_worker) {
+            (RenderExecutionPolicy::WorkerCapableWithLocalFallback, true) => {
+                RenderConsumerPath::LocalWorkerPrototype
+            }
+            _ => RenderConsumerPath::LocalSynchronous,
+        }
+    }
 }
 
 pub trait RenderSurface {
     fn consume_submission(&mut self, submission: &RenderSubmission);
 }
 
+#[derive(Debug, Default)]
+pub struct LocalRenderWorker;
+
+impl LocalRenderWorker {
+    pub fn consume_latest<S: RenderSurface>(
+        &mut self,
+        manager: &mut RenderManager,
+        surface: &mut S,
+    ) -> bool {
+        manager.publish_latest(surface)
+    }
+}
+
 #[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
 pub struct RenderTelemetrySnapshot {
     pub produced_submissions: u64,
@@ -499,6 +535,30 @@ mod tests {
         assert!(!policy.uses_frame_scheduler());
     }
 
+    #[test]
+    fn render_policy_resolves_game_worker_only_when_capability_is_enabled() {
+        let policy = RenderPolicy::for_app_mode(AppMode::Game);
+
+        assert_eq!(
+            policy.resolve_consumer_path(RenderRuntimeCapabilities::default()),
+            RenderConsumerPath::LocalSynchronous
+        );
+        assert_eq!(
+            policy.resolve_consumer_path(RenderRuntimeCapabilities { game_render_worker: true }),
+            RenderConsumerPath::LocalWorkerPrototype
+        );
+    }
+
+    #[test]
+    fn render_policy_keeps_shell_local_even_when_worker_capability_is_enabled() {
+        let policy = RenderPolicy::for_app_mode(AppMode::Shell);
+
+        assert_eq!(
+            policy.resolve_consumer_path(RenderRuntimeCapabilities { game_render_worker: true }),
+            RenderConsumerPath::LocalSynchronous
+        );
+    }
+
     #[test]
     fn active_render_policy_follows_app_mode_transition() {
         let mut manager = RenderManager::new(AppMode::Game);
@@ -522,6 +582,20 @@ mod tests {
         assert_eq!(surface.seen, vec![FrameId::new(0)]);
     }
 
+    #[test]
+    fn local_render_worker_consumes_latest_game_submission() {
+        let mut manager = RenderManager::new(AppMode::Game);
+        let mut surface = RecordingSurface::default();
+        let mut worker = LocalRenderWorker;
+
+        manager.close_compat_frame();
+        assert!(worker.consume_latest(&mut manager, &mut surface));
+
+        assert_eq!(surface.seen, vec![FrameId::ZERO]);
+        assert_eq!(manager.render_telemetry().consumed_submissions, 1);
+        assert_eq!(manager.render_telemetry().presented_frames, 1);
+    }
+
     #[test]
     fn render_handoff_takes_owned_latest_submission() {
         let mut handoff = RenderHandoff::default();

crates/console/prometeu-system/src/services/vm_runtime/tick.rs

@@ -1,5 +1,5 @@
 use super::dispatch::VmRuntimeHost;
-use super::render_manager::RenderSurface;
+use super::render_manager::{LocalRenderWorker, RenderConsumerPath, RenderSurface};
 use super::*;
 use crate::CrashReport;
 use crate::fs::{FsState, VirtualFS};
@@ -261,7 +261,19 @@ impl VirtualMachineRuntime {
 
                         if let Err(payload) = catch_unwind(AssertUnwindSafe(|| {
                             let mut surface = HardwareRenderSurface { hw };
-                            self.render_manager.publish_latest(&mut surface);
+                            match self
+                                .render_manager
+                                .active_render_policy()
+                                .resolve_consumer_path(self.render_capabilities)
+                            {
+                                RenderConsumerPath::LocalSynchronous => {
+                                    self.render_manager.publish_latest(&mut surface);
+                                }
+                                RenderConsumerPath::LocalWorkerPrototype => {
+                                    let mut worker = LocalRenderWorker;
+                                    worker.consume_latest(&mut self.render_manager, &mut surface);
+                                }
+                            }
                         })) {
                             let message = Self::host_panic_payload_to_string(payload);
                             let report = CrashReport::VmPanic { message, pc: Some(vm.pc() as u32) };

discussion/index.ndjson

@@ -1,6 +1,6 @@
 {"type":"meta","next_id":{"DSC":42,"AGD":42,"DEC":32,"PLN":98,"LSN":48,"CLSN":1}}
 {"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":"in_progress","ticket":"vm-render-parallel-execution-boundary","title":"VM and Render Parallel Execution Boundary","created_at":"2026-06-04","updated_at":"2026-06-05","tags":["runtime","renderer","vm","concurrency","architecture","perf"],"agendas":[{"id":"AGD-0040","file":"AGD-0040-vm-and-render-parallel-execution-boundary.md","status":"accepted","created_at":"2026-06-04","updated_at":"2026-06-05"}],"decisions":[{"id":"DEC-0031","file":"DEC-0031-vm-and-render-parallel-execution-boundary.md","status":"accepted","created_at":"2026-06-05","updated_at":"2026-06-05","ref_agenda":"AGD-0040"}],"plans":[{"id":"PLN-0087","file":"PLN-0087-fix-game2d-packet-overlay-composition.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0088","file":"PLN-0088-define-read-only-render-resource-boundary.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0089","file":"PLN-0089-introduce-render-handoff-abstraction.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0090","file":"PLN-0090-add-render-frame-pacing-contract.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0091","file":"PLN-0091-implement-appmode-render-policy-matrix.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0092","file":"PLN-0092-add-render-epoch-ownership-transitions.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0093","file":"PLN-0093-add-render-telemetry-counters-and-events.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0094","file":"PLN-0094-specify-async-render-boundary.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0095","file":"PLN-0095-prototype-local-render-worker-capability.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0096","file":"PLN-0096-define-render-shutdown-and-failure-handling.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0097","file":"PLN-0097-add-async-render-integration-test-matrix.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]}],"lessons":[]}
+{"type":"discussion","id":"DSC-0040","status":"in_progress","ticket":"vm-render-parallel-execution-boundary","title":"VM and Render Parallel Execution Boundary","created_at":"2026-06-04","updated_at":"2026-06-05","tags":["runtime","renderer","vm","concurrency","architecture","perf"],"agendas":[{"id":"AGD-0040","file":"AGD-0040-vm-and-render-parallel-execution-boundary.md","status":"accepted","created_at":"2026-06-04","updated_at":"2026-06-05"}],"decisions":[{"id":"DEC-0031","file":"DEC-0031-vm-and-render-parallel-execution-boundary.md","status":"accepted","created_at":"2026-06-05","updated_at":"2026-06-05","ref_agenda":"AGD-0040"}],"plans":[{"id":"PLN-0087","file":"PLN-0087-fix-game2d-packet-overlay-composition.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0088","file":"PLN-0088-define-read-only-render-resource-boundary.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0089","file":"PLN-0089-introduce-render-handoff-abstraction.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0090","file":"PLN-0090-add-render-frame-pacing-contract.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0091","file":"PLN-0091-implement-appmode-render-policy-matrix.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0092","file":"PLN-0092-add-render-epoch-ownership-transitions.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0093","file":"PLN-0093-add-render-telemetry-counters-and-events.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0094","file":"PLN-0094-specify-async-render-boundary.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0095","file":"PLN-0095-prototype-local-render-worker-capability.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0096","file":"PLN-0096-define-render-shutdown-and-failure-handling.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0097","file":"PLN-0097-add-async-render-integration-test-matrix.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]}],"lessons":[]}
 {"type":"discussion","id":"DSC-0041","status":"open","ticket":"foreground-stack-game-pause-shell-vm-backed","title":"Foreground Stack, Game Pause, and VM-Backed Shell Coexistence","created_at":"2026-06-05","updated_at":"2026-06-05","tags":["runtime","os","lifecycle","shell","game","vm","foreground","architecture"],"agendas":[{"id":"AGD-0041","file":"AGD-0041-foreground-stack-game-pause-shell-vm-backed.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05"}],"decisions":[],"plans":[],"lessons":[]}
 {"type":"discussion","id":"DSC-0038","status":"done","ticket":"render-frame-packet-boundary","title":"Logical Render Pipelines and Command Packets","created_at":"2026-05-25","updated_at":"2026-06-04","tags":["gfx","renderer","runtime","frame-composer","architecture","ui","pipeline"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0047","file":"discussion/lessons/DSC-0038-render-frame-packet-boundary/LSN-0047-typed-render-submissions-preserve-domain-boundaries.md","status":"done","created_at":"2026-06-04","updated_at":"2026-06-04"}]}
 {"type":"discussion","id":"DSC-0035","status":"done","ticket":"task-owned-shell-windows","title":"Agenda - Task-Owned Shell Windows","created_at":"2026-05-15","updated_at":"2026-05-15","tags":["runtime","os","task","window-manager","shell","lifecycle"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0044","file":"discussion/lessons/DSC-0035-task-owned-shell-windows/LSN-0044-task-window-liveness-belongs-to-the-task.md","status":"done","created_at":"2026-05-15","updated_at":"2026-05-15"}]}

discussion/workflow/plans/PLN-0095-prototype-local-render-worker-capability.md

@@ -2,7 +2,7 @@
 id: PLN-0095
 ticket: vm-render-parallel-execution-boundary
 title: Prototype Local Render Worker Capability
-status: open
+status: done
 created: 2026-06-05
 ref_decisions: [DEC-0031]
 tags: [runtime, host, renderer, worker, prototype]