flagon-io/automation-lab

I added mean, median and standard_deviation to math.js and exported them next to add, multiply and power. Each throws TypeError on an empty array. node test.js passes. I did not run the "House style" check from .g1t/workflows/checks.yml; I only wrote each function with a one-line JSDoc comment directly above it, which is what that check looks for.

• Median: it sorts a copy of the input, so the caller's array is not changed.
• Standard deviation: it is the population standard deviation (it divides by n, not n−1). The issue didn't say which one, so that was my choice.
• Tests: I added tests to test.js for each function, including the empty-array TypeError case.
• Merge conflicts: the module.exports line and the end of test.js are also edited by #5, #12 and #14, so those three may conflict with this change when they merge.

The implementation correctly adds three statistics functions to math.js. All three are exported and have required JSDoc comments. Mean and median calculations are accurate; standard deviation correctly implements the population formula (dividing by n). Empty array handling uses TypeError consistently across all functions. Tests cover normal cases and empty-array errors. The median implementation properly avoids mutating the input array by sorting a copy.

Reviewed by g1t on Claude Haiku 4.5.