test(hooks): remove unsafe test assertions

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

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

src/hooks/start-work/index.test.ts

@@ -738,7 +738,7 @@ You are starting a Sisyphus work session.
       const promptAsyncMock = spyOn({
         promptAsync: async (_request: unknown) => undefined,
       }, "promptAsync")
-      const ctx = {
+      const ctx = testCoerce<Parameters<typeof createAtlasHook>[0]>({
         directory: testDir,
         client: {
           session: {
@@ -747,7 +747,7 @@ You are starting a Sisyphus work session.
             messages: async () => ({ data: [] }),
           },
         },
-      } as unknown as Parameters<typeof createAtlasHook>[0]
+      })
       const startWorkHook = createStartWorkHook(ctx)
       const atlasHook = createAtlasHook(ctx)
       const output = {
@@ -784,18 +784,18 @@ You are starting a Sisyphus work session.
         promptAsync: async (_request: unknown) => undefined,
       }, "promptAsync")
 
-      globalThis.setTimeout = ((callback: Function, delay?: number, ...args: unknown[]) => {
+      globalThis.setTimeout = testCoerce<typeof setTimeout>(((callback: Function, delay?: number, ...args: unknown[]) => {
         const normalized = typeof delay === "number" ? delay : 0
         if (normalized >= 5000) {
           const id = nextTimerId++
           capturedTimers.set(id, { callback: () => callback(...args), cleared: false })
-          return id as unknown as ReturnType<typeof setTimeout>
+          return testCoerce<ReturnType<typeof setTimeout>>(id)
         }
 
         return originalSetTimeout(callback as Parameters<typeof originalSetTimeout>[0], delay)
-      }) as unknown as typeof setTimeout
+      }))
 
-      globalThis.clearTimeout = ((id?: number | ReturnType<typeof setTimeout>) => {
+      globalThis.clearTimeout = testCoerce<typeof clearTimeout>(((id?: number | ReturnType<typeof setTimeout>) => {
         if (typeof id === "number" && capturedTimers.has(id)) {
           capturedTimers.get(id)!.cleared = true
           capturedTimers.delete(id)
@@ -803,11 +803,11 @@ You are starting a Sisyphus work session.
         }
 
         originalClearTimeout(id as Parameters<typeof originalClearTimeout>[0])
-      }) as unknown as typeof clearTimeout
+      }))
 
       Date.now = () => fakeNow
 
-      const ctx = {
+      const ctx = testCoerce<Parameters<typeof createAtlasHook>[0]>({
         directory: testDir,
         client: {
           session: {
@@ -816,13 +816,13 @@ You are starting a Sisyphus work session.
             messages: async () => ({ data: [] }),
           },
         },
-      } as unknown as Parameters<typeof createAtlasHook>[0]
+      })
       const startWorkHook = createStartWorkHook(ctx)
       const atlasHook = createAtlasHook(ctx, {
         directory: testDir,
-        backgroundManager: {
+        backgroundManager: testCoerce<NonNullable<Parameters<typeof createAtlasHook>[1]>["backgroundManager"]>({
           getTasksByParentSession: () => backgroundRunning ? [{ status: "running" }] : [],
-        } as unknown as NonNullable<Parameters<typeof createAtlasHook>[1]>["backgroundManager"],
+        }),
       })
       const output = {
         message: {} as Record<string, unknown>,