docs: rewrite README for open-source launch
Merged
AN
8mo ago+133+133+012345678901234567890123456789-64-64-01234567890123456789
Position as opencode fork specialized for data teams. Add comparison table, detailed feature sections, and correct badge URLs.
Summary
What changed and why?
Test Plan
How was this tested?
Checklist
- Tests added/updated
- Documentation updated (if needed)
- CHANGELOG updated (if user-facing)