Documentation Link Validation

Analyze documentation files for broken links, missing targets, and navigation issues.

Detection Patterns

1. Broken Relative Links

<!-- BROKEN: Target file doesn't exist -->
See [installation guide](docs/install.md)
<!-- File docs/install.md not found -->

<!-- BROKEN: Wrong path depth -->
See [API docs](../docs/api.md)
<!-- Should be ./docs/api.md -->