polyc-agent 2026.9.0

The agent turn loop: provider + tool-call routing, shared by the control plane and harness.
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The agent turn loop.

Implements the standard function-calling loop: call the provider; while it asks for tools, execute them and feed the results back; repeat until the model ends its turn. Provider streaming chunks are folded into a turn via [polyc_llm::turn::collect_turn]; the assistant/tool messages are mapped to wire [Message]s for the control plane.