feat: declare hasOutOfProcessLiveness and remove onSpawn workarounds (FAR-24)

- Add `hasOutOfProcessLiveness: true` to createServerAdapter() so the
  reaper skips local PID checks and uses the staleness window instead.
- Remove the initial onSpawn call and all periodic keepalive onSpawn
  refreshes that were compensating for the missing flag.
- Remove POST_TERMINAL_KEEPALIVE_MS constant and keepaliveTick counter
  that backed those workarounds.
- Cast required: adapter-utils ServerAdapterModule type predates this field.
- Bump to 0.1.38.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/server/index.ts

@@ -33,9 +33,13 @@ export function createServerAdapter(): ServerAdapterModule {
     supportsInstructionsBundle: true,
     instructionsPathKey: "instructionsFilePath",
     requiresMaterializedRuntimeSkills: false,
+    // Tells the reaper to skip local PID checks and use the staleness-based
+    // liveness window instead (adapter spawns K8s Jobs in separate pods).
+    // Cast required: adapter-utils ServerAdapterModule type predates this field.
+    hasOutOfProcessLiveness: true,
     agentConfigurationDoc,
     getConfigSchema,
-  };
+  } as ServerAdapterModule;
 }
 
 export { execute, testEnvironment, sessionCodec };