test(core): use lightweight clear in cron, claude runner, and telegram delivery specs

src/agents/claude-cli-runner.e2e.test.ts

@@ -74,7 +74,7 @@ async function waitForCalls(mockFn: { mock: { calls: unknown[][] } }, count: num
 
 describe("runClaudeCliAgent", () => {
   beforeEach(() => {
-    mocks.spawn.mockReset();
+    mocks.spawn.mockClear();
   });
 
   it("starts a new session with --session-id when none is provided", async () => {

src/agents/tools/cron-tool.e2e.test.ts

@@ -38,7 +38,7 @@ describe("cron tool", () => {
   }
 
   beforeEach(() => {
-    callGatewayMock.mockReset();
+    callGatewayMock.mockClear();
     callGatewayMock.mockResolvedValue({ ok: true });
   });