Full rewrite focused on what consumers actually need: install, a
working snippet per provider, and the public API surface.
Changes vs the previous version:
- Document ClaudeCodeProvider, including the subscription-via-CLI
auth path that the new provider enables.
- Remove the ProviderRegistry section (the class was removed in R1).
- Drop the stale Provider Comparison and Detailed Capabilities
tables; vendor capabilities and model lists move too fast for a
README to track.
- Remove the inaccurate Zero Dependencies and Comprehensive Testing
claims (post-refactor 44/91 tests need updating).
- Refresh default models (Gemini 1.5 -> 2.5) and the package list to
match the current build.
- Add a brief Architecture note covering the base hooks introduced
in R2 and the OpenWebUI strategy split from R3.
README is 315 lines (was 701).
