v0.83.0

Initial PyPI release of the Python port (pi-py-* packages).

Published distributions:

• pi-py-ai 0.83.0
• pi-py-agent-core 0.83.0
• pi-py-storage-sqlite 0.83.0
• pi-py-coding-agent 0.83.0
• pi-py-server 0.83.0

Install: pip install pi-py-ai etc. Import names unchanged (pi_ai, pi_agent_core, …).