feat: add per-tool safety dashboard with health stats

[conorluddy]

Summary

Track GitHub stars, last commit date, license, and security advisories per tool. Display as a new website section and in CLI verify output.

Motivation

Users and agents should be able to assess tool health at a glance — is the tool actively maintained? Does it have known vulnerabilities? What license does it use?

Proposed Implementation

• Fetch GitHub stats (stars, last commit, license) for each tool in the catalog
• Check for security advisories via GitHub API
• New website section: Safety dashboard with health indicators per tool
• Extend verify CLI output with health metadata
• Cache results to avoid rate limiting (24h TTL)

Design

Similar aesthetic to existing catalog rows — add health badges (green/amber/red) based on:

• Last commit: green (<6 months), amber (6-12 months), red (>12 months)
• License: green (MIT/Apache/BSD), amber (other OSS), red (unknown)
• Advisories: green (none), red (active)