Take-Home: Build a Small Metrics/Log Processor

Question

## Problem

New Relic uses a take-home: build a small service that ingests logs/metrics, computes aggregates, and exposes a query endpoint.

## Example
```
POST /ingest, GET /stats?metric=&window= -> aggregate
```

## Constraints
- Clean structure, tests, README

## What New Relic looks for
Production-quality code: validation, error handling, tests, and clear docs.