- Update openspec-conventions spec with delta-based approach
- Add Header-Based Requirement Identification for programmatic matching
- Define ADDED/MODIFIED/REMOVED/RENAMED sections format
- Document standard output symbols (+ ~ - →)
- Update openspec/README.md with delta conventions and examples
- Update init command template to use delta format
- Mark completed tasks in adopt-delta-based-changes/tasks.md
This implements the first part of the delta-based changes proposal,
updating all documentation and conventions to support the new format.
Tabish Bidiwale