Report on the current project state.

Steps:
1. Read `./docs/summaries/00-project-brief.md` for project context.
2. Find and read the latest `handoff-*.md` file in `./docs/summaries/` for current state.
3. List all files in `./docs/summaries/` to understand what's been processed.
4. Report:
   - **Project:** name and type from the project brief
   - **Current phase:** based on the project phase tracker
   - **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)
