docs: update version references and counts across markdown files

- AGENTS.md: version 3.0.0 → 3.1.0-dev
- CLAUDE.md: version v3.0.0 → v3.1.0-dev (2 places)
- ROADMAP.md: status v2.7.0 → v3.1.0-dev, 18 MCP tools → 26, 1200+ tests → 1,880+, add recent improvements
- docs/README.md: "New in v2.7.0" → "New in v3.x", 1200+ tests → 1,880+, docs version 2.7.0 → 3.1.0-dev, date updated

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docs/README.md

@@ -4,7 +4,7 @@ Welcome to the Skill Seekers documentation hub. This directory contains comprehe
 
 ## 📚 Quick Navigation
 
-### 🆕 New in v2.7.0
+### 🆕 New in v3.x
 
 **Recently Added Documentation:**
 - ⭐ [Quick Reference](QUICK_REFERENCE.md) - One-page cheat sheet
@@ -37,7 +37,7 @@ Essential guides for setup and daily usage:
 - **Usage Guides**
   - [Usage Guide](guides/USAGE.md) - Comprehensive usage instructions
   - [Upload Guide](guides/UPLOAD_GUIDE.md) - Uploading skills to platforms
-  - [Testing Guide](guides/TESTING_GUIDE.md) - Complete testing reference (1200+ tests)
+  - [Testing Guide](guides/TESTING_GUIDE.md) - Complete testing reference (1,880+ tests)
   - [Migration Guide](guides/MIGRATION_GUIDE.md) - Version upgrade instructions
 
 ### ⚡ Feature Documentation
@@ -142,7 +142,7 @@ Want to contribute? See:
 → [MCP Setup Guide](guides/MCP_SETUP.md)
 
 **Run tests**
-→ [Testing Guide](guides/TESTING_GUIDE.md) - 1200+ tests
+→ [Testing Guide](guides/TESTING_GUIDE.md) - 1,880+ tests
 
 **Understand code quality standards**
 → [Code Quality](reference/CODE_QUALITY.md) - Linting and CI/CD
@@ -197,6 +197,6 @@ Want to contribute? See:
 
 ---
 
-**Documentation Version**: 2.7.0
-**Last Updated**: 2026-01-18
+**Documentation Version**: 3.1.0-dev
+**Last Updated**: 2026-02-18
 **Status**: ✅ Complete & Organized