v0.5.0

Added

• MCP Logging - real-time structured log notifications to clients via MCP protocol
• search_keys tool - search keys by substring (case-insensitive), matches key names and source text
• Xcode 26 compatibility - verified format version 1.1 roundtrip with test fixture
• localization_audit prompt - complete audit: coverage, validation, stale keys, glossary
• fix_validation_errors prompt - guided workflow to fix issues by severity
• add_language prompt - add a new locale and translate all strings step-by-step

Changed

• Extracted shared build_translation_unit helper to eliminate code duplication in extractor

Removed

• 5 unused error variants (ValidationFailed, FormatSpecifierMismatch, MissingPluralForm, ShouldNotTranslate, Unexpected)