refactored: to utilise the google adk and production grade agent

VALIDATION.md

@@ -1,13 +1,21 @@
-# Validation runbook
+# Validation Runbook
 
 Run from the repository root without credentials:
 
 ```bash
+# 1. Static artifact & guide section validation
+python3 scripts/validate_artifacts.py
+
+# 2. Pytest unit & integration test suite
+pytest -v
+
+# 3. Offline ADK evaluation benchmark suite
+python3 -m eval.eval_harness
+
+# 4. Optional Terraform formatting & validation
 terraform -chdir=terraform fmt -check -recursive
 terraform -chdir=terraform init -backend=false
 terraform -chdir=terraform validate
-python3 scripts/validate_artifacts.py
-python3 -m pytest -q
 ```
 
 `init -backend=false` may download the pinned provider constraint but does not create infrastructure. Do not use `terraform apply` as part of validation. A deployment candidate additionally requires an operator-supplied `terraform plan -out=tfplan` and human review.