Tree C: discovered or built: work log

Append-only and chronological. Each entry records what was done, why, any surprises, and what comes next, in enough detail for a stranger to pick up mid-stride.

2026-09-30: planning

What: wrote plan.md, summary.md, direction-questions.md and both todo files from the research survey (../../Review.md, ../../research-plan.md). Next: see todo-agent.md.