chore: Add clarifications to docs

Signed-off-by: Giulio Frasca <[email protected]>

Author: gmfrasca

docs/AGENTS.md

@@ -15,5 +15,5 @@ This document serves as a comprehensive context source for AI agents to understa
 
 For immediate guidance, see:
 - [Contributing Guide](CONTRIBUTING.md)
-- [Onboarding Guide](ONBOARDING.md)
+- [Governance Guide](GOVERNANCE.md)
 - [Best Practices Guide](BESTPRACTICES.md)

docs/BESTPRACTICES.md

@@ -17,6 +17,5 @@ This document will cover:
 ---
 
 For immediate guidance, see:
-- [Contributing Guide](CONTRIBUTING.md)
-- [Onboarding Guide](ONBOARDING.md)
-- [Testing Guide](TESTING.md)
+- [Contributing Guide](CONTRIBUTING.md) - Complete guide with testing, setup, and workflow
+- [Governance Guide](GOVERNANCE.md) - Repository policies and tiers