Add an anlyse command

In addition to the validate command, there should be an analyze command.

llms-txt-cli analyze llms.txt

Output could be:

llms.txt Analysis
────────────────────────────────────

Structure              10/10
Content                 8/10
Links                   9/10
Discoverability         7/10
Token efficiency        8/10

Overall                  8.4/10  A

✓ H1 title
✓ Blockquote description
✓ 7 sections
✓ 42 links
✓ All URLs are HTTPS
✓ No duplicate URLs

⚠ 3 links have no descriptions
⚠ 2 sections contain > 15 links
⚠ 1 URL redirects
⚠ No llms-full.txt reference

Recommendations:

  1. Add descriptions to 3 links
  2. Consider splitting "API Reference"
  3. Check redirected URLs

Start by reading the existing validate command and the CLI entry point to understand how commands are registered and how llms.txt files are processed. Define the analysis criteria, scoring, warnings, and recommendations represented by the proposed output; done means llms-txt-cli analyze llms.txt produces a consistent report.