fix(lint): resolve action-validator failure on language-version-detect

- Remove unsupported `deprecated: true` from language-version-detect/action.yml
  (deprecation already communicated via description field)
- Scope action-validator pre-commit hook to workflow and action.yml files only
- Make missing pre-commit a hard error in lint-actions target

Makefile

@@ -332,7 +332,8 @@ lint-actions: ## Validate GitHub Actions workflows and action.yml files
 			exit 1; \
 		fi; \
 	else \
-		echo "$(YELLOW)⚠️ pre-commit not found, skipping action-validator$(RESET)"; \
+		echo "$(RED)❌ pre-commit not found. Install it via 'make install-tools' before linting$(RESET)"; \
+		exit 1; \
 	fi
 
 # Check targets