Support multiple paths in a single CLI call to `analyze`

The tool should support passing multiple PATH arguments via either comma-separated (or space-separated) paths:

Either:
```
uvx mfcqi analyze --skip-llm redis_sre_agent/cli/cache.py,redis_sre_agent/cli/index.py
```

Or:
```
uvx mfcqi analyze --skip-llm redis_sre_agent/cli/cache.py redis_sre_agent/cli/index.py

```