fix(kernel-agents): test expectations and task logging

[grypez]

This PR contains two minor fixes for the recently added kernel agents package (#668).

• Two test expectations at the end of agent end to ends tests were no ops
• The agent's task method was logging to the base logger instead of the taskLogger

---

Note

Switch task result/exit logs to task-scoped logger and fix e2e assertions to properly match expected strings.

• Kernel Agents:
  • Route results and exit invocation logs in packages/kernel-agents/src/agent.ts to taskLogger instead of logger.
• Tests:
  • Update e2e expectations in packages/kernel-agents/test/e2e/agent.test.ts from includes to toMatch to properly assert outputs.

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