SDK/print-mode turn telemetry reworked

What

• Turn execution in SDK/non-interactive (print) mode now uses two new internal classes: one that tracks whether a turn is in flight and emits tengu_sdk_result (or tengu_sdk_session_crash) on shutdown or crash, and another that runs each turn and emits tengu_sdk_result with a new breakdown of tool call counts into MCP tool calls, tool-search calls, and built-in tool calls.
• A companion class manages adopting a model override at the end of a turn and logs tengu_print_model_override_adopted with the previous and new model.
• The telemetry sent when a run is shut down mid-way (status terminated) now goes through one shared method (reportTerminatedOnShutdown) instead of being built inline, so aborted/runPhase/exitCode reporting is consistent.

Why This gives clearer visibility into how SDK-driven and print-mode sessions end and what kinds of tool calls they made, and makes the shutdown telemetry more consistent and easier to maintain.