[BUG] Tasks persist as stale/in-progress after context compaction

Description

When a Claude Code session hits context limits and is compacted, any tasks created via TaskCreate that are still in_progress or pending are not cleaned up. They remain visible in subsequent sessions, falsely implying work is actively happening.

Steps to Reproduce

1. Start a session and create tasks with TaskCreate
2. Set one to in_progress
3. Work until the session is context-compacted
4. Continue in the resumed/compacted session
5. The task list still shows the old in_progress task — no active work is running

Expected Behavior

After context compaction, stale in_progress tasks should be reset or a system reminder should prompt the agent to reconcile the task list at session start.

Actual Behavior

Tasks remain with their pre-compaction status indefinitely. Users see in_progress tasks and reasonably assume something is running in the background when nothing is.

Suggested Fix

On compaction, either:

• Automatically reset in_progress → pending, or
• Inject a note in the compaction summary reminding the agent to run TaskList and clean up stale tasks

Environment

• Claude Code CLI (latest)
• macOS 14.6