Read Python version from .tool-versions (#996)

## Summary
- read the Python version from an explicitly selected `.tool-versions`
file
- preserve `python-version` and existing `UV_PYTHON` precedence
- add parser, input, and workflow coverage and update documentation and
bundled action artifacts

## Validation
- `npm run all`
- `actionlint .github/workflows/test.yml`
- `uvx zizmor .github/workflows/test.yml`

Closes #983

Refs: pi-session 019ff01a-544c-79f3-8f73-a00132af39f5

__tests__/version/tool-versions-file.test.ts

@@ -21,6 +21,11 @@ async function getVersionFromToolVersions(filePath: string) {
   return getUvVersionFromToolVersions(filePath);
 }
 
+async function getPythonVersionFromToolVersions(filePath: string) {
+  const module = await import("../../src/version/tool-versions-file");
+  return module.getPythonVersionFromToolVersions(filePath);
+}
+
 describe("getUvVersionFromToolVersions", () => {
   beforeEach(() => {
     jest.resetModules();
@@ -61,8 +66,8 @@ describe("getUvVersionFromToolVersions", () => {
     expect(result).toBe("0.3.0");
   });
 
-  it("should skip commented lines", async () => {
-    const fileContent = "# uv 0.1.0\npython 3.11.0\nuv 0.2.0";
+  it("should skip comments", async () => {
+    const fileContent = "# uv 0.1.0\npython 3.11.0\nuv 0.2.0 # inline comment";
     mockReadFileSync.mockReturnValue(fileContent);
 
     const result = await getVersionFromToolVersions(".tool-versions");
@@ -121,3 +126,68 @@ describe("getUvVersionFromToolVersions", () => {
     );
   });
 });
+
+describe("getPythonVersionFromToolVersions", () => {
+  beforeEach(() => {
+    jest.resetModules();
+    jest.clearAllMocks();
+  });
+
+  it("should return version for a valid Python entry", async () => {
+    mockReadFileSync.mockReturnValue(
+      "nodejs 24.0.0\r\npython v3.13.1t # use free-threaded Python\r\nuv 0.12.3",
+    );
+
+    const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+    expect(result).toBe("3.13.1t");
+  });
+
+  it("should return the first matching Python version", async () => {
+    mockReadFileSync.mockReturnValue("python 3.12\npython 3.13");
+
+    const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+    expect(result).toBe("3.12");
+  });
+
+  it("should return undefined when no Python entry is found", async () => {
+    mockReadFileSync.mockReturnValue("uv 0.12.3\nnodejs 24.0.0");
+
+    const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+    expect(result).toBeUndefined();
+  });
+
+  it("should warn and return undefined for multiple Python versions", async () => {
+    mockReadFileSync.mockReturnValue("python 3.13 3.12 system");
+
+    const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+    expect(result).toBeUndefined();
+    expect(mockWarning).toHaveBeenCalledWith(
+      "Multiple Python versions in .tool-versions are not supported. The Python entry will be ignored.",
+    );
+  });
+
+  it.each(["ref:main", "path:~/src/python", "system"])(
+    "should warn and return undefined for %s",
+    async (version) => {
+      mockReadFileSync.mockReturnValue(`python ${version}`);
+
+      const result = await getPythonVersionFromToolVersions(".tool-versions");
+
+      expect(result).toBeUndefined();
+      expect(mockWarning).toHaveBeenCalledWith(
+        `The Python version ${version} in .tool-versions is not supported. The Python entry will be ignored.`,
+      );
+    },
+  );
+
+  it("should return undefined for non-.tool-versions files", async () => {
+    const result = await getPythonVersionFromToolVersions(".python-version");
+
+    expect(result).toBeUndefined();
+    expect(mockReadFileSync).not.toHaveBeenCalled();
+  });
+});