Handoff summary template

# Project
Package: <pkgname>
Goal: <one sentence>
Branch/version: <...>

# Conventions
<bullets of non-negotiables>

# Current work item
Feature/bug:
Acceptance criteria:

# Code surface area
Files + functions:

# State
Done:
TODO:
Known failing logs:

# Decisions made
<API/testing/behavior decisions>

# Next deliverable
<what you want the agent to produce in the new chat>