docs: update stale version numbers, MCP counts, and test counts across docs/

Version headers/footers updated to 3.1.0-dev:
- docs/features/BOOTSTRAP_SKILL_TECHNICAL.md (was 2.8.0-dev)
- docs/reference/API_REFERENCE.md (was 2.7.0)
- docs/reference/CODE_QUALITY.md (was 2.7.0)
- docs/guides/TESTING_GUIDE.md (was 2.7.0)
- docs/guides/MIGRATION_GUIDE.md (was 2.7.0, historical tables untouched)

MCP tool count 18 → 26:
- docs/guides/MCP_SETUP.md
- docs/guides/TESTING_GUIDE.md
- docs/reference/CODE_QUALITY.md
- docs/reference/CLAUDE_INTEGRATION.md
- docs/integrations/CLINE.md
- docs/strategy/INTEGRATION_STRATEGY.md

Test count 700+/1200+ → 1,880+:
- docs/guides/MCP_SETUP.md
- docs/guides/TESTING_GUIDE.md
- docs/reference/CODE_QUALITY.md
- docs/reference/CLAUDE_INTEGRATION.md
- docs/features/HOW_TO_GUIDES.md
- docs/blog/UNIVERSAL_RAG_PREPROCESSOR.md

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

docs/features/BOOTSTRAP_SKILL_TECHNICAL.md

@@ -1,9 +1,9 @@
 # Bootstrap Skill - Technical Deep Dive
 
-**Version:** 2.8.0-dev
+**Version:** 3.1.0-dev
 **Feature:** Bootstrap Skill Technical Analysis
 **Status:** ✅ Production Ready
-**Last Updated:** 2026-01-20
+**Last Updated:** 2026-02-18
 
 ---
 
@@ -664,6 +664,6 @@ The Bootstrap Skill is a **meta-application** that demonstrates Skill Seekers' c
 
 ---
 
-**Version:** 2.8.0-dev
-**Last Updated:** 2026-01-20
+**Version:** 3.1.0-dev
+**Last Updated:** 2026-02-18
 **Status:** ✅ Technical Deep Dive Complete

docs/features/HOW_TO_GUIDES.md

@@ -1294,7 +1294,7 @@ def test_api_integration_workflow():
 
 **Test Set:** Skill_Seekers own test suite
 - 54 test files
-- 700+ total tests
+- 1,880+ total tests
 - 50+ workflow examples
 
 **Performance:**