Record the user's daily activities, progress, decisions, and learnings in a structured, chronological format.
Each day has its own file named yyyy-mm-dd.md (e.g., 2025-06-15.md). Create a new file for each new day; append entries to the existing file if one already exists for today.
yyyy-mm-dd.mdcontent format, for example:
# yyyy-mm-dd
## [short description]
- [1-3 sentence summary of what happened]
yyyy-mm-dd