Build a git commit history analyzer with visualization

Create a CLI tool that analyzes a git repository commit history and generates insights: commit frequency patterns, top contributors, conventional commit compliance, average PR size, code churn hotspots, and a summary report. Output as JSON and optionally as an HTML report with charts.

Requirements

Acceptance Criteria

[
  "CLI accepts a local git repo path and analyzes the last N commits (configurable, default 500)",
  "Generates metrics: commits per day/week, top 10 contributors by commits and lines changed, conventional commit compliance percentage",
  "Identifies code churn hotspots (files changed most frequently in the last 30 days)",
  "JSON output mode with structured data for all metrics",
  "HTML report mode with at least 3 charts (commit frequency over time, contributor distribution, file churn heatmap)",
  "8+ unit tests with a fixture git repo covering edge cases (empty repo, single commit, merge commits)",
  "Works on repos with 10,000+ commits without hanging (process in streaming fashion)"
]

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