test: fix flaky Windows temp-dir cleanup in az stop-interception test

TestAzStopInterceptionNoOpWhenNotIntercepting is the only az test that runs the
real az binary against a temp HOME on Windows. az spawns background processes
that hold handles open under HOME\.azure, so t.TempDir()'s auto RemoveAll fails
with "being used by another process" and fails an otherwise-passing test.

Use a best-effort temp HOME (azTempHome) that ignores cleanup errors instead.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: gtsiolis

test/integration/az_interception_test.go

@@ -56,7 +56,7 @@ func TestAzStopInterceptionNoOpWhenNotIntercepting(t *testing.T) {
 	requireAzCLI(t)
 	t.Parallel()
 	workDir := azureWorkDir(t)
-	home := t.TempDir() // fresh ~/.azure: active cloud is the default AzureCloud
+	home := azTempHome(t) // fresh ~/.azure: active cloud is the default AzureCloud
 
 	stdout, _, err := runLstk(t, testContext(t), workDir,
 		env.With(env.Home, home),

test/integration/setup_azure_test.go

@@ -22,6 +22,19 @@ func requireAzCLI(t *testing.T) {
 	}
 }
 
+// azTempHome returns a temporary HOME directory whose cleanup tolerates Windows
+// failures. The Azure CLI spawns background processes that keep handles open
+// under HOME\.azure, so Go's t.TempDir() auto-cleanup can fail with "being used
+// by another process" on Windows and wrongly fail an otherwise-passing test.
+// We remove it best-effort instead.
+func azTempHome(t *testing.T) string {
+	t.Helper()
+	dir, err := os.MkdirTemp("", "lstk-az-home-")
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = os.RemoveAll(dir) })
+	return dir
+}
+
 // azureWorkDir prepares a fresh workDir with a project-local `.lstk/config.toml`
 // containing an Azure container, and returns its path. Tests run `lstk` with
 // `cmd.Dir = workDir` so the project-local config search finds this file —