Shared memory and context tools for agentic work.
Code Rooms
## What
Brief description of the change.
## Why
Motivation and context.
## Testing
- [ ] `cargo test --workspace` passes
- [ ] `cargo clippy --workspace` clean
- [ ] Documentation updated if needed
- [ ] New tools registered in `server.rs` dispatch
## Breaking Changes
List any breaking changes to MCP tool signatures, or write "None".
