test(hooks): update multiple hook test suites

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/atlas/background-task-retry.test.ts

@@ -6,7 +6,7 @@ import { randomUUID } from "node:crypto"
 import type { PluginInput } from "@opencode-ai/plugin"
 import { createAtlasHook } from "./atlas-hook"
 import { clearBoulderState, writeBoulderState } from "../../features/boulder-state"
-import { _resetForTesting, registerAgentName, setSessionAgent } from "../../features/claude-code-session-state"
+import { _resetForTesting, clearSessionAgent, registerAgentName, setSessionAgent } from "../../features/claude-code-session-state"
 
 // Force process isolation in CI runner (globalThis.setTimeout override conflicts with other atlas tests)
 mock.module("../../shared/opencode-storage-detection", () => ({
@@ -401,7 +401,8 @@ describe("atlas background task retry", () => {
     // when
     await hook.handler({ event: { type: "session.idle", properties: { sessionID: descendantSessionID } } })
     expect(capturedTimers.size).toBe(1)
-    descendantAgent = "sisyphus-junior"
+    descendantAgent = "prometheus"
+    clearSessionAgent(descendantSessionID)
     backgroundRunning = false
     await firePendingTimers()