- Updated main-agent middleware to clarify that both filesystem reads/writes and knowledge-base retrieval are handled by the `knowledge_base` subagent.
- Introduced `_forward_mention_pins` function to carry `@`-mention pins into subagent state.
- Revised system prompts to reflect the new retrieval method and ensure proper citation handling.
- Removed the `search_knowledge_base` tool and its related tests, consolidating functionality under the `task` tool.
- Enhanced documentation to guide usage of the new retrieval approach and citation practices.
Add unit tests for role-specific turn extraction in the resolver and for
the transcript renderer: full rendering within budget, dropping oldest
turns with a marker, partial-tail fill of an overflowing turn, and
multi-chat tagging.
