Initial import from garrytan/gstack@026751e (main snapshot via local relay)

Source: https://github.com/garrytan/gstack/commit/026751e

lib/conductor-env-shim.ts

@@ -0,0 +1,18 @@
+/**
+ * Conductor workspaces don't inherit the user's interactive shell env, so the
+ * canonical ANTHROPIC_API_KEY / OPENAI_API_KEY may be missing while
+ * Conductor's GSTACK_-prefixed forms are present. Promote the GSTACK_ form to
+ * canonical when canonical is empty, so subprocesses (gbrain embed,
+ * @anthropic-ai/claude-agent-sdk, etc) pick it up.
+ *
+ * Import this for its side effect: `import "../lib/conductor-env-shim";`
+ */
+export function promoteConductorEnv(): void {
+  for (const key of ["ANTHROPIC_API_KEY", "OPENAI_API_KEY"] as const) {
+    if (!process.env[key] && process.env[`GSTACK_${key}`]) {
+      process.env[key] = process.env[`GSTACK_${key}`];
+    }
+  }
+}
+
+promoteConductorEnv();