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

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

test/skill-e2e-plan-mode-no-op.test.ts

@@ -0,0 +1,48 @@
+/**
+ * Plan-mode-info no-op regression (gate tier, paid, real-PTY).
+ *
+ * Asserts: when /plan-ceo-review is invoked OUTSIDE plan mode (no
+ * --permission-mode plan flag, no plan-mode reminder injected), the skill
+ * still reaches a terminal outcome ('asked' or 'plan_ready'). This is the
+ * negative coverage to the per-skill plan-mode smokes — if the
+ * plan-mode-info preamble section ever starts misfiring for non-plan-mode
+ * sessions (e.g., gating questions on a phrase that isn't there), this
+ * test catches it.
+ *
+ * Why this matters: outside plan mode, claude doesn't render a native
+ * confirmation UI. The skill must drive its own AskUserQuestion. Same
+ * runner, same outcome contract — just `inPlanMode: false`.
+ */
+
+import { describe, test, expect } from 'bun:test';
+import { runPlanSkillObservation } from './helpers/claude-pty-runner';
+
+const shouldRun = !!process.env.EVALS && process.env.EVALS_TIER === 'gate';
+const describeE2E = shouldRun ? describe : describe.skip;
+
+describeE2E('plan-mode-info no-op outside plan mode (gate regression)', () => {
+  test('skill reaches a terminal outcome outside plan mode', async () => {
+    const obs = await runPlanSkillObservation({
+      skillName: 'plan-ceo-review',
+      inPlanMode: false,
+      timeoutMs: 300_000,
+    });
+
+    if (obs.outcome === 'silent_write' || obs.outcome === 'exited' || obs.outcome === 'timeout') {
+      throw new Error(
+        `plan-mode no-op regression FAILED: outcome=${obs.outcome}\n` +
+          `summary: ${obs.summary}\n` +
+          `elapsed: ${obs.elapsedMs}ms\n` +
+          `--- evidence (last 2KB visible) ---\n${obs.evidence}`,
+      );
+    }
+    expect(['asked', 'plan_ready']).toContain(obs.outcome);
+
+    // Negative regression: the rendered output must NOT echo the plan-mode
+    // distinctive reminder phrase. If it does, the plan-mode preamble
+    // section is leaking outside plan mode.
+    const PLAN_MODE_REMINDER =
+      'Plan mode is active. The user indicated that they do not want you to execute yet';
+    expect(obs.evidence).not.toContain(PLAN_MODE_REMINDER);
+  }, 360_000);
+});