log-progress

name	log-progress
description	Record a progress log entry for the current session. Appends to docs/PROGRESS.md and updates docs/FEATURES.json if any feature status changed.

Log Progress

Append a new session entry to docs/PROGRESS.md:

## Session — [today's date and time]
- **Feature**: [ID] — [name]
- **Status**: [Complete / In Progress / Blocked]
- **What was built**: [summary]
- **Tests**: [what tests were added/updated]
- **Issues**: [any problems encountered]
- **Next**: [recommended next step]

Also update docs/FEATURES.json if any feature status changed.