Create Python SDK for HTTP transport

[irparent]

Iris supports HTTP transport but there's no Python SDK. Python is the primary language for AI/ML development.

Goal: Create a lightweight Python package (iris-eval) that wraps the HTTP API.

Acceptance criteria:

• pip install iris-eval
• IrisClient class with methods: log_trace(), evaluate_output(), get_traces()
• Authentication via API key
• Type hints for all parameters
• Async support (httpx)
• Published to PyPI

Resources:

• HTTP transport examples: examples/http-transport/client.py
• API reference