update_server/docs/agents/validation/README.md

Validation Directory

Save one validation markdown file here after every validation pass.

Naming convention:

• 01-foundation-validation.md
• 02-database-validation.md
• 03-auth-validation.md
• 04-projects-releases-validation.md
• 05-api-keys-validation.md
• 06-client-api-ui-validation.md
• 07-security-deploy-validation.md