fix(python): respect precompiled flavor when excluding freethreaded builds (#8745)

Previously, if any flavor was specified (e.g., 'install_only_stripped'),
the freethreaded exclusion was skipped, causing 'mise lock' to sometimes
pick the freethreaded build incorrectly. Now it only allows freethreaded
builds if the requested flavor specifically includes 'freethreaded'.

Fixes #8739

*This PR was generated by an AI.*

Author: risu729

e2e/lockfile/test_lockfile_python_flavor

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+# Test that precompiled_flavor setting is respected in lockfile generation
+# Regression test for https://github.com/jdx/mise/discussions/8739
+export MISE_LOCKFILE=1
+
+detect_platform
+
+cat <<EOF >mise.toml
+[tools]
+python = "3.13.5"
+
+[settings.python]
+precompiled_flavor = "install_only_stripped"
+EOF
+
+rm -f mise.lock
+
+mise lock --platform "$MISE_PLATFORM"
+
+# Verify lockfile does NOT contain freethreaded URLs
+assert_not_contains "cat mise.lock" "freethreaded"
+
+# Verify lockfile contains the correct flavor
+assert_contains "cat mise.lock" "install_only_stripped"
+
+rm -f mise.lock mise.toml
+
+echo "Python lockfile flavor test passed!"

src/plugins/core/python.rs

@@ -203,7 +203,7 @@ impl PythonPlugin {
                 let versions = raw
                     .lines()
                     .filter(|v| v.contains(&platform))
-                    .filter(|v| flavor.is_some() || !v.contains("freethreaded"))
+                    .filter(|v| filter_freethreaded(v, &flavor))
                     .flat_map(|v| {
                         // cpython-3.9.5+20210525 or cpython-3.9.5rc3+20210525
                         regex!(r"^cpython-(\d+\.\d+\.[\da-z]+)\+(\d+).*")
@@ -504,7 +504,7 @@ impl PythonPlugin {
         let result = raw
             .lines()
             .filter(|v| v.contains(&platform))
-            .filter(|v| flavor.is_some() || !v.contains("freethreaded"))
+            .filter(|v| filter_freethreaded(v, &flavor))
             .flat_map(|v| {
                 regex!(r"^cpython-(\d+\.\d+\.[\da-z]+)\+(\d+).*")
                     .captures(v)
@@ -825,3 +825,7 @@ fn ensure_not_windows() -> eyre::Result<()> {
     }
     Ok(())
 }
+
+fn filter_freethreaded(v: &str, flavor: &Option<String>) -> bool {
+    flavor.as_ref().is_some_and(|f| f.contains("freethreaded")) || !v.contains("freethreaded")
+}