Report on the current project state.

Steps:
1. Find and read the latest `handoff-*.md` file in `./docs/summaries/` for current state.
2. List all files in `./docs/summaries/` to understand what's been processed.
3. Report:
   - **Last session:** what was accomplished (from the latest handoff)
   - **Next steps:** what the next session should do (from the latest handoff)
   - **Open questions:** anything unresolved
   - **Summary file count:** how many files in docs/summaries/ (warn if approaching 15)