markdown_paths_resolve

Validate that backticked workspace paths in markdown files resolve to real files or directories in the repo. Targets the AGENTS.md / CLAUDE.md / .cursorrules staleness problem: agent-context files reference paths in inline backticks (`src/api/users.ts`), and those paths drift as the codebase evolves. The agent-context-no-stale-paths rule shipped in v0.6 surfaces candidates via a regex; this rule does the precise existence check.

- id: agents-md-paths-resolve
  kind: markdown_paths_resolve
  paths:
    - AGENTS.md
    - CLAUDE.md
    - .cursorrules
    - "docs/**/*.md"
  prefixes:
    - src/
    - crates/
    - docs/
  level: warning

The prefixes list is required — a backticked token must start with one of these to be considered a path candidate. No defaults: every project’s layout differs, and a missing prefix is silent while a wrong default trips false positives.

The scanner skips fenced code blocks (``` / ~~~) and 4-space-indented blocks; those contain code samples, not factual claims about the tree. Trailing :line / #L<n> location suffixes are stripped before lookup, as are trailing punctuation and trailing slashes. Glob characters (*, ?, [) trigger globset matching against the file index — pass if at least one file matches.

By default the rule skips backticked tokens containing template-variable markers ({{ }}, ${ }, <…>). Set ignore_template_vars: false to validate them as literal paths.

Check-only — auto-fixing a stale path means guessing the new location, which is unsafe.