Function strip_comments 

pub fn strip_comments(content: &str) -> String

Strip comments from document content for diff comparison.

Removes:

• HTML comments <!-- ... --> (single and multiline) — EXCEPT agent range markers
• Link reference comments [//]: # (...)

Skips <!-- sequences inside fenced code blocks and inline backtick spans to prevent code examples containing <!-- from being misinterpreted as comment starts.

This function is the shared implementation used by both diff::compute (binary) and external crates like eval-runner.