v0.3.0

Changelog

• 1aa2e87 feat: add Provider type for validated LLM provider selection
• 0f6cd1b feat: add template.Name type for validated template names
• 2d898ef refactor: convert lang package to Language type with parse-time validation
• ec384c1 refactor: update cli package to use Provider, Language, and template.Name types
• 5b5a1b4 refactor: update live command to parse options at CLI boundary
• a141ae4 refactor: update restructure package to use typed Language and template.Name
• c433076 refactor: update structure command to parse options at CLI boundary
• a8bf323 refactor: update transcribe command to parse options at CLI boundary
• 9dd8b75 refactor: update transcribe package to use lang.Language type