handoff

Print the handoff summary directly in the conversation (do NOT create files). The user copies it into the first message of the next session to resume context.

Infer content from the current conversation context + git diff + task list. Ask the user to fill gaps if information is insufficient.

Format:

## Current Status
(One sentence summarizing progress)

## Completed
- ...

## Not Yet Done
- ...

## Key Decisions
- ...