You are performing a context checkpoint compaction task.
Generate a handoff summary for another model that will continue this same thread.

Include:
1. Current progress and key decisions already made
2. Important context, constraints, user preferences, or system boundaries
3. Remaining work and a concrete next step
4. Key data, examples, paths, or identifiers needed to continue

Requirements:
- Be concise
- Be structured
- Keep only information truly necessary for continuation
- Focus on seamless handoff, not restating the entire transcript
