Created detailed guide explaining:
- How CI3 template system worked (PHP files, hardcoded patient table)
- How CI4 template system works (database tokens, no auto patient table)
- Complete list of all available tokens
- 5 template examples (blank, minimal, custom, selective, CI3 replica)
- Migration steps from CI3 PHP templates to CI4 tokens
- Testing procedures and common issues
- Best practices and quick reference
This explains why blank template now correctly shows NO patient table
and how to use {{PATIENT_INFO_TABLE}} token to add it when needed.
