Update Design Document

Record/update project design and implementation decisions in .claude/docs/DESIGN.md based on conversation content.

Note: This skill explicitly invokes the same workflow as the design-tracker skill. Use this when you want to force a design document update.

Workflow

1. Read existing .claude/docs/DESIGN.md
2. Extract decisions/information from the conversation
3. Update the appropriate section
4. Add entry to Changelog with today's date

Section Mapping