feat: update guidelines across multiple documents to enforce strict rules and best practices for code structure and testing

feat: update SKILL.md to version 4.0.0 and enhance best practices guidelines

feat: implement interface contracts for repositories and datasources to enhance testability

docs: update guideline for file organization to clarify class structure and exceptions

feat: add sync integration section to showcase-tours

docs: add section on avoiding shrinkWrap in ListView/GridView for improved performance

feat(evals): enhance evaluation prompts and expected outputs for better clarity and detail

Refactor provider references from Notifier to Provider across multiple documentation files

Enhance Freezed model documentation with rich model guidelines and examples; add methods to Product class for better data handling

Enhance showcase tour mixin to handle offstage tabs and improve showcase retry logic

Enhance showcase service documentation with reset signal implementation and lifecycle considerations

Enhance showcase tour initialization by handling loading state transitions and cached data

Update SKILL.md to reflect new features and version bump; add showcase-tours.md documentation for guided tours

Update SKILL.md and common-patterns.md to include delta sync patterns and repository interface for incremental data fetching

Update README.md and SKILL.md to include Hive CE persistence; add hive-persistence.md documentation