Add reasoning capability forwarding to HeadroomAgnoModel

Add Phase 2 Progressive Summarization and fix Agno integration tests

Fix test_on_llm_error to pass required run_id argument

Fix HeadroomAgnoModel to extend agno.models.base.Model and add real integration tests

Add Agno agent framework integration

Add seamless LangChain integration

Fix all ruff lint and format errors for CI

Initial commit: Headroom SDK - LLM context optimization toolkit