feat: append TODO list as markdown to compaction summary

[kermanx]

Related Issue

N/A — this is a standalone feature request.

Problem

Compaction replaces the conversation prefix with a summary, but the TODO list (maintained via the TodoList tool) is stored separately in the tool store. After compaction, the LLM no longer sees outstanding TODOs in context, which can cause tasks to be forgotten during long sessions.

What changed

• Added a post-process step in FullCompaction.compactionWorker that appends the current TODO list to the generated summary before it is written to history.
• Reused the existing renderTodoList helper from todo-list.ts, adding an optional title parameter so the output can start with a ## TODO List heading for compaction while keeping the original Current todo list: heading for the tool response.
• If the TODO list is empty, nothing is appended.
• Added a test case in full.test.ts verifying the appended format.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 2ea9582

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@moonshot-ai/agent-core	Minor
@moonshot-ai/kimi-code	Minor
@moonshot-ai/migration-legacy	Patch

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commit: 2ea9582

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