node running, runtime version awareness

packs/core/runtimes/python.yaml

@@ -19,7 +19,7 @@ distributions:
         pattern: "Python 3\\."
         priority: 2
   min_version: "3.8"
-  recommended_version: "3.11"
+  recommended_version: "3.12"
 
 installation:
   package_managers:
@@ -53,3 +53,118 @@ execution_config:
       - install
       - "-r"
       - "{manifest_path}"
+
+# Version-specific execution configurations.
+# Each entry describes how to invoke a particular Python version.
+# The worker uses these when an action declares a runtime_version constraint
+# (e.g., runtime_version: ">=3.12"). The highest available version satisfying
+# the constraint is selected, and its execution_config replaces the parent's.
+versions:
+  - version: "3.11"
+    distributions:
+      verification:
+        commands:
+          - binary: python3.11
+            args:
+              - "--version"
+            exit_code: 0
+            pattern: "Python 3\\.11\\."
+            priority: 1
+    execution_config:
+      interpreter:
+        binary: python3.11
+        args:
+          - "-u"
+        file_extension: ".py"
+      environment:
+        env_type: virtualenv
+        dir_name: ".venv"
+        create_command:
+          - python3.11
+          - "-m"
+          - venv
+          - "--copies"
+          - "{env_dir}"
+        interpreter_path: "{env_dir}/bin/python3.11"
+      dependencies:
+        manifest_file: requirements.txt
+        install_command:
+          - "{interpreter}"
+          - "-m"
+          - pip
+          - install
+          - "-r"
+          - "{manifest_path}"
+
+  - version: "3.12"
+    is_default: true
+    distributions:
+      verification:
+        commands:
+          - binary: python3.12
+            args:
+              - "--version"
+            exit_code: 0
+            pattern: "Python 3\\.12\\."
+            priority: 1
+    execution_config:
+      interpreter:
+        binary: python3.12
+        args:
+          - "-u"
+        file_extension: ".py"
+      environment:
+        env_type: virtualenv
+        dir_name: ".venv"
+        create_command:
+          - python3.12
+          - "-m"
+          - venv
+          - "--copies"
+          - "{env_dir}"
+        interpreter_path: "{env_dir}/bin/python3.12"
+      dependencies:
+        manifest_file: requirements.txt
+        install_command:
+          - "{interpreter}"
+          - "-m"
+          - pip
+          - install
+          - "-r"
+          - "{manifest_path}"
+
+  - version: "3.13"
+    distributions:
+      verification:
+        commands:
+          - binary: python3.13
+            args:
+              - "--version"
+            exit_code: 0
+            pattern: "Python 3\\.13\\."
+            priority: 1
+    execution_config:
+      interpreter:
+        binary: python3.13
+        args:
+          - "-u"
+        file_extension: ".py"
+      environment:
+        env_type: virtualenv
+        dir_name: ".venv"
+        create_command:
+          - python3.13
+          - "-m"
+          - venv
+          - "--copies"
+          - "{env_dir}"
+        interpreter_path: "{env_dir}/bin/python3.13"
+      dependencies:
+        manifest_file: requirements.txt
+        install_command:
+          - "{interpreter}"
+          - "-m"
+          - pip
+          - install
+          - "-r"
+          - "{manifest_path}"