Add integration tests for monitoring system (Guardian, Conductor, MonitoringLoop)

[kivo360]

Problem

The monitoring system — the core "readjustment" pillar of OmoiOS — has zero integration tests:

• MonitoringLoop — Orchestrates Guardian + Conductor loops
• IntelligentGuardian — LLM-powered per-agent trajectory analysis
• ConductorService — System-wide coherence scoring + duplicate detection

These are critical services that determine if agents are drifting from goals.

What to do

Create test files in backend/tests/integration/:

1. test_monitoring_loop.py: Test the loop starts, runs Guardian/Conductor cycles, and handles errors
2. test_intelligent_guardian.py: Test trajectory analysis scoring, intervention decisions, mock LLM responses
3. test_conductor.py: Test coherence scoring, duplicate work detection

Use pytest-asyncio for async tests and mock the LLM service to avoid real API calls.

Reference: ARCHITECTURE.md — Testing Requirements checklist

Difficulty: Medium-Hard | Skill: Python (pytest, async testing)