fix: isolate tests from workspace CODI_HOME env var

tests/setup.ts

@@ -0,0 +1,13 @@
+// Copyright 2026 Layne Penney
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+/**
+ * Vitest global setup.
+ *
+ * Removes workspace-specific environment variables that interfere with
+ * test isolation.  CODI_HOME is set by envsetup.sh to point at the
+ * workspace .codi directory, but tests expect the default home-relative
+ * path (~/.codi).
+ */
+
+delete process.env.CODI_HOME;

vitest.config.ts

@@ -4,6 +4,7 @@ export default defineConfig({
   test: {
     environment: 'node',
     globals: true,
+    setupFiles: ['tests/setup.ts'],
     include: ['tests/**/*.test.ts', 'tests/**/*.test.tsx'],
     // Default timeout (increased for e2e tests in their own files)
     testTimeout: 10000,