fix(test): resolve gbrain detect install paths and session import xargs crash

bin/gstack-codex-session-import

@@ -65,7 +65,7 @@ case "$MODE" in
       exit 0
     fi
     LATEST=$(find "$CODEX_SESSIONS_ROOT" -type f -name "rollout-*.jsonl" -print 2>/dev/null \
-      | xargs ls -t 2>/dev/null | head -1 || true)
+      | xargs -r ls -t 2>/dev/null | head -1 || true)
     if [ -z "$LATEST" ]; then
       echo "NO_SESSIONS: no rollout-*.jsonl files under $CODEX_SESSIONS_ROOT"
       exit 0

test/gbrain-detect-install.test.ts

@@ -24,8 +24,10 @@ const INSTALL = path.join(ROOT, 'bin', 'gstack-gbrain-install');
 // Minimal PATH with POSIX tools + homebrew (for jq/git/curl) but no user-bin
 // dirs — this keeps `gbrain` out of PATH deterministically across dev machines
 // while still finding jq, git, curl, sed, cat, etc. Each test can prepend a
-// fake-gbrain dir when it wants to simulate presence.
-const SAFE_PATH = '/usr/bin:/bin:/usr/sbin:/sbin:/opt/homebrew/bin:/usr/local/bin';
+// fake-gbrain dir when it wants to simulate presence. We append the active Bun
+// directory so the script shebang can find bun.
+const BUN_DIR = path.dirname(process.execPath);
+const SAFE_PATH = `/usr/bin:/bin:/usr/sbin:/sbin:/opt/homebrew/bin:/usr/local/bin:${BUN_DIR}`;
 
 let tmpHome: string;
 let tmpHomeReal: string;

test/gbrain-refresh-install-render.test.ts

@@ -13,7 +13,7 @@ const SRC = fs.readFileSync(path.join(ROOT, 'bin', 'gstack-config'), 'utf-8');
 // satisfied by unrelated text elsewhere in the file.
 function okBranch(): string {
   const start = SRC.indexOf('gbrain-refresh)');
-  const ok = SRC.indexOf('ok)', start);
+  const ok = SRC.indexOf('ok|timeout)', start);
   const end = SRC.indexOf(';;', ok);
   if (start < 0 || ok < 0 || end < 0) throw new Error('Could not locate gbrain-refresh ok) branch');
   return SRC.slice(ok, end);