Create a new service apps/devindex/services/Heuristics.mjs that implements statistical analysis on user contribution data.

Responsibilities:

1. Analyze(user): Takes a minified user object.
2. Calculate Metrics:
   • velocity: Max contributions per day (Max Yearly / 365).
   • acceleration: Growth factor (Max Year / Median of Non-Zero Years).
   • consistency: Count of years with significant activity (>100 commits).
3. Return: A minified object h containing { v, a, c }.

Constraints:

• Pure math, no external dependencies.
• Robust handling of zero-division or empty histories.
• Optimized for performance (called in tight loop).