Code sample checker

Find and check every code sample in a docs set so that copied examples work for readers and agents.

Status

Scaffold only — not ready for use.

Planned

• Extract fenced code blocks with their language tags and surrounding context
• Lint or parse each sample for its language and flag missing language tags
• Flag deprecated APIs, outdated package versions, and placeholder values that are not explained
• Run safe, self-contained samples in a sandbox when the user allows it
• Check that equivalent samples in different languages do the same thing