v1.9.3 — Gemini SDK migration + README cleanup
What's new
Migrated off the deprecated Gemini SDK
Google deprecated `google-generativeai` in favour of a new unified SDK, `google-genai`. GeminiProvider now uses `genai.Client(...).models.generate_content_stream(...)` — same streaming interface, no behaviour change for users.
README fixes
- Acknowledgements section's Google SDK link now points at the SDK actually installed (`googleapis/python-genai`) rather than the deprecated package's repo
- "Compare versions" description now mentions Quark-Engine threat-level diffing — the feature has done this since v1.7.0 but the docs never caught up
See CHANGELOG.md for full history.