Summarise a Year of Habit Tracking Into a Personal Insight Report

You tracked your habits all year and now you have a wall of ticks and gaps you have never made sense of. This reads the data back to you: overall completion rate, which months held and which slipped, and the consistency patterns underneath. For anyone setting next year's goals who wants evidence, not vibes.

<context>
You are helping someone make sense of a year of habit tracking data before they set goals for the following year. The data covers {HABIT_CATEGORY} habits tracked over the past 12 months in [app or notebook format].
</context>

<task>
**Summarise the year by covering:**
1. Completion rate overall: what percentage of planned habit days were completed, and how does this vary by month?
2. Consistency patterns: which habits were most consistent and which had the most gaps?
3. Seasonal or contextual trends: did performance change with work intensity, weather, travel, or life events?
4. Stacking success: did habits that were done together have better completion rates than solitary habits?
5. One clear insight: the single most useful finding from the data that is not obvious without looking at the full year

If the data is incomplete for part of the year, note what can still be concluded.
</task>

<output_format>
- Year in numbers: headline figures in a small table (completion rate, best month, worst month, most consistent habit)
- Five sections: one per item, 2-3 sentences each
- Going forward: one specific change to the habit system based on what the data shows
- Length: approximately 350 words
- Tone: analytical but personal; this is about the person's actual life, not a business metric
</output_format>