docs: document PrefectDbtRunner lifecycle hooks (on_run_start, post_model, on_run_end)

[github-actions]

Automated documentation update triggered by commit da54120.

This PR was generated by Claude Code analyzing source code changes and updating any stale documentation.

Source files changed in triggering push

src/integrations/prefect-dbt/prefect_dbt/__init__.py
src/integrations/prefect-dbt/prefect_dbt/core/__init__.py
src/integrations/prefect-dbt/prefect_dbt/core/_hooks.py
src/integrations/prefect-dbt/prefect_dbt/core/_orchestrator.py
src/integrations/prefect-dbt/prefect_dbt/core/runner.py

Missing coverage recommendations

The following new features have no documentation yet and may need new pages or sections:

Missing coverage recommendations

PrefectDbtOrchestrator lifecycle hooks

PrefectDbtOrchestrator also gained the same on_run_start, on_run_end, and post_model
lifecycle hooks via DbtHookMixin. There is no standalone docs page for
PrefectDbtOrchestrator — it is only mentioned in release notes. A new page at
docs/integrations/prefect-dbt/orchestrator.mdx would provide a good home for
PrefectDbtOrchestrator usage including the new hooks API.

DbtHookContext API reference

DbtHookContext is now a first-class public export from prefect_dbt. The generated
API reference at integrations/prefect-dbt/api-ref/ will pick it up automatically on
the next mdxify run, but the hand-authored runner.mdx now documents its fields inline.
No additional action needed beyond the hooks section added to runner.mdx.

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