fix(subagent): remove permission.question=deny override that caused zombie sessions

Child session creation was injecting permission: { question: 'deny' } which
conflicted with OpenCode's child session permission handling, causing subagent
sessions to hang with 0 messages after creation (zombie state).

Remove the permission override from all session creators (BackgroundManager,
sync-session-creator, call-omo-agent) and rely on prompt-level tool restrictions
(tools.question=false) to maintain the intended policy.

Closes #1711

src/features/background-agent/manager.test.ts

@@ -1520,7 +1520,7 @@ describe("BackgroundManager - Non-blocking Queue Integration", () => {
   })
 
   describe("task transitions pending→running when slot available", () => {
-    test("should inherit parent session permission rules (and force deny question)", async () => {
+    test("does not override parent session permission when creating child session", async () => {
       // given
       const createCalls: any[] = []
       const parentPermission = [
@@ -1562,11 +1562,7 @@ describe("BackgroundManager - Non-blocking Queue Integration", () => {
 
       // then
       expect(createCalls).toHaveLength(1)
-      const permission = createCalls[0]?.body?.permission
-      expect(permission).toEqual([
-        { permission: "plan_enter", action: "deny", pattern: "*" },
-        { permission: "question", action: "deny", pattern: "*" },
-      ])
+      expect(createCalls[0]?.body?.permission).toBeUndefined()
     })
 
     test("should transition first task to running immediately", async () => {

src/features/background-agent/manager.ts

@@ -236,17 +236,10 @@ export class BackgroundManager {
     const parentDirectory = parentSession?.data?.directory ?? this.directory
     log(`[background-agent] Parent dir: ${parentSession?.data?.directory}, using: ${parentDirectory}`)
 
-    const inheritedPermission = (parentSession as any)?.data?.permission
-    const permissionRules = Array.isArray(inheritedPermission)
-      ? inheritedPermission.filter((r: any) => r?.permission !== "question")
-      : []
-    permissionRules.push({ permission: "question", action: "deny" as const, pattern: "*" })
-
     const createResult = await this.client.session.create({
       body: {
         parentID: input.parentSessionID,
         title: `${input.description} (@${input.agent} subagent)`,
-        permission: permissionRules,
       } as any,
       query: {
         directory: parentDirectory,

src/features/background-agent/spawner.test.ts

@@ -3,7 +3,7 @@ import { describe, test, expect } from "bun:test"
 import { createTask, startTask } from "./spawner"
 
 describe("background-agent spawner.startTask", () => {
-  test("should inherit parent session permission rules (and force deny question)", async () => {
+  test("does not override parent session permission rules when creating child session", async () => {
     //#given
     const createCalls: any[] = []
     const parentPermission = [
@@ -57,9 +57,6 @@ describe("background-agent spawner.startTask", () => {
 
     //#then
     expect(createCalls).toHaveLength(1)
-    expect(createCalls[0]?.body?.permission).toEqual([
-      { permission: "plan_enter", action: "deny", pattern: "*" },
-      { permission: "question", action: "deny", pattern: "*" },
-    ])
+    expect(createCalls[0]?.body?.permission).toBeUndefined()
   })
 })

src/features/background-agent/spawner.ts

@@ -58,17 +58,10 @@ export async function startTask(
   const parentDirectory = parentSession?.data?.directory ?? directory
   log(`[background-agent] Parent dir: ${parentSession?.data?.directory}, using: ${parentDirectory}`)
 
-  const inheritedPermission = (parentSession as any)?.data?.permission
-  const permissionRules = Array.isArray(inheritedPermission)
-    ? inheritedPermission.filter((r: any) => r?.permission !== "question")
-    : []
-  permissionRules.push({ permission: "question", action: "deny" as const, pattern: "*" })
-
   const createResult = await client.session.create({
     body: {
       parentID: input.parentSessionID,
       title: `Background: ${input.description}`,
-      permission: permissionRules,
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     } as any,
     query: {

src/features/background-agent/spawner/background-session-creator.ts

@@ -15,7 +15,6 @@ export async function createBackgroundSession(options: {
   const body = {
     parentID: input.parentSessionID,
     title: `Background: ${input.description}`,
-    permission: [{ permission: "question", action: "deny" as const, pattern: "*" }],
   }
 
   const createResult = await client.session

src/features/background-agent/task-starter.ts

@@ -69,7 +69,6 @@ export async function startQueuedTask(args: {
     body: {
       parentID: input.parentSessionID,
       title: `${input.description} (@${input.agent} subagent)`,
-      permission: [{ permission: "question", action: "deny" as const, pattern: "*" }],
     } as any,
     query: {
       directory: parentDirectory,