Add HTML report output format

[pikespeak]

Goal

Add an HTML report as an output format for ottersight scan.

Context

An HTML report is useful for sharing scan results with non-technical stakeholders or embedding in documentation. The report should be a self-contained HTML file with inline CSS (no external dependencies).

Relevant files

• packages/cli/src/renderers/ — existing renderers (terminal table, Markdown)
• packages/scanner/src/types.ts — scan result types

Expected interface

ottersight scan . --format html > report.html

Outputs a complete, styled HTML page to stdout with:

• Summary header (total components, total vulns, KEV count)
• Severity-grouped vulnerability tables
• Component list

Getting started

1. Read CONTRIBUTING.md for setup instructions
2. Look at the existing Markdown renderer for the pattern
3. Create a new renderer in packages/cli/src/renderers/html.ts
4. Add tests

Happy to answer questions in the comments!