added script converter

[JakeNesler]

Summary

Adds script annotation support, image handling, and changes the URL scheme from .md suffix to ?gremllm query parameter.

Script Handling

• Scripts with data-llm-description attribute are replaced with descriptive text for LLMs
• Scripts without the attribute are stripped entirely
• Scripts with data-llm="keep" are preserved

<script data-llm-description="Calculator: add, subtract, multiply, divide"> function calc() { ... } </script>

Image Handling

• Images are replaced with [Image: alt text] format
• Images without alt text become [Image] (or removed if RemoveImagesNoAlt=true)

Expanded Default Strip List

• Now strips: nav, aside, footer, header, script, style, noscript, svg, iframe
• All can be preserved with data-llm="keep"

URL Scheme Change

• Before: /index.md → serves processed /index.html
• After: /index.html?gremllm → serves processed HTML
• Avoids conflicts with actual .md files
• Only processes text/html responses with 200 status

Test Plan

• Existing tests pass
• New tests for script/image handling
• Manual testing with example page (/index.html vs /index.html?gremllm)