fix(project): set runtimeVersion on the CodeZip template

The CDK construct library rejects a CodeZip runtime that declares no
runtimeVersion ("runtimeVersion is required for CodeZip builds"), and it is the
field that selects the packager. Without it, synthesizing a freshly created
python project fails on its own scaffolded config.

Container builds take their version from the image, so the container template
is unaffected.

Author: notgitika

src/core/project/manager.test.ts

@@ -97,6 +97,7 @@ describe("FsProjectManager.create", () => {
         build: "CodeZip",
         entrypoint: "main.py",
         codeLocation: "app/hello-world",
+        runtimeVersion: "PYTHON_3_14",
       },
     ]);
     expect(await Bun.file(join(configDir, "aws-targets.json")).json()).toEqual([]);

src/core/project/templates.ts

@@ -32,6 +32,10 @@ export const TEMPLATES: Record<ProjectTemplate, Template> = {
           build: "CodeZip",
           entrypoint: "main.py",
           codeLocation: "app/hello-world",
+          // Required for CodeZip builds: the CDK construct library rejects a
+          // CodeZip runtime with no runtimeVersion, and it is what selects the
+          // packager. Container builds take their version from the image.
+          runtimeVersion: "PYTHON_3_14",
         },
       ],
     },