chore: add release artifacts and sync stats (v3.5.0 compliance)

RELEASE_NOTES.md

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+# Release v3.5.0: Community & Clarity
+
+> **Expanding the ecosystem with new community contributions and improved accessibility.**
+
+This release welcomes new community contributors and improves documentation accessibility with English translations for key skills.
+
+## 🚀 New Skills
+
+### [infinite-gratitude](https://github.com/sstklen/infinite-gratitude)
+
+**Multi-agent research skill**
+Parallel research execution with 10 agents, battle-tested with real case studies.
+
+- **Added to**: Community Contributors
+
+### [claude-api-cost-optimization](https://github.com/sstklen/claude-api-cost-optimization)
+
+**Cost Optimization Strategies**
+Practical strategies to save 50-90% on Claude API costs.
+
+- **Added to**: Community Contributors
+
+## 📦 Improvements
+
+- **Localization**: Translated `daily-news-report` description to English.
+- **Registry Update**: Now tracking **256** skills.
+- **Documentation**: Synced contributors and skill counts across all docs.
+
+## 👥 Credits
+
+A huge shoutout to our community contributors:
+
+- **@sstklen** for `infinite-gratitude` and `claude-api-cost-optimization`
+- **@rookie-ricardo** for `daily-news-report`
+
+---
+
+_Upgrade now: `git pull origin main` to fetch the latest skills._