- Create PLANNING.md with detailed project architecture and phases
- Create TASK.md with 200+ hour development plan broken into 6 phases
- Add French language support (fr_FR/declarationtva.lang)
- Update English translations with CA3-specific terminology
- Define CA3 box structure and PCG account mappings
- Plan bilingual interface for French-speaking users
- Include database schema, testing, and documentation phases
- Add core module structure
- Include admin interface
- Add language support (en_US)
- Include SQL schema
- Add build configuration
- Include documentation and licensing
