Load rule files from ~/.vibe/rules/ into the system prompt.

Rule files are Markdown files (.md) scanned recursively. Optional YAML frontmatter controls filtering:

---
models: "openai_codex/*"
---
Always use pattern matching instead of if/else chains.

Rules without models: frontmatter apply to all models. The models: field accepts a glob pattern or list of patterns matched against provider:model_id.

Loaded automatically by Vibe.Plugins.Rules.