feat(agent-presets): enable background Codex and Claude Code subagent tasks

examples/acp-agent/tests/fixtures/subagent/subagent-claude-code/cordis.yml

@@ -1,4 +1,4 @@
-# Test-only composition of both public opt-in providers and foreground tools.
+# Test-only composition of both public opt-in providers and one-shot task tools.
 # The owning e2e boots this tree but never invokes a model or product process.
 - id: fixture
   name: './fixture.ts'
@@ -20,7 +20,7 @@
   config:
     provider: codex
     toolName: subagent_codex
-    enableRunInBackground: false
+    backgroundMode: one-shot
     maxDepth: 'provider-managed'
 
 - id: tool-subagent-claude-code
@@ -28,7 +28,7 @@
   config:
     provider: claude-code
     toolName: subagent_claude_code
-    enableRunInBackground: false
+    backgroundMode: one-shot
     maxDepth: 'provider-managed'
 
 - id: agent-spine

examples/acp-agent/tests/fixtures/subagent/subagent-claude-code/driver.ts

@@ -53,11 +53,16 @@ try {
       required: tool.parameters.required,
     }
   })
+  const taskTools = ctx.tools.schemas()
+    .map(schema => schema.name)
+    .filter(name => name === 'task_kill' || name === 'task_list' || name === 'task_output')
+    .sort()
 
   process.stdout.write(`${JSON.stringify({
     registeredProviders: ctx.subagents.list(),
     providers,
     tools,
+    taskTools,
     starts,
   })}\n`)
 } finally {