test(gsd): add regression tests for wave 3 session fixes

Tests tri-state hasImplementationArtifacts return values and
AutoSession.consecutiveCompleteBootstraps per-session isolation
and reset() behavior.

src/resources/extensions/gsd/tests/wave3-session-regressions.test.ts

@@ -0,0 +1,47 @@
+// GSD State Machine — Wave 3 Session Regression Tests
+// Validates tri-state hasImplementationArtifacts and AutoSession.consecutiveCompleteBootstraps.
+
+import { describe, test } from "node:test";
+import assert from "node:assert/strict";
+import { hasImplementationArtifacts } from "../auto-recovery.js";
+import { AutoSession } from "../auto/session.js";
+
+// ── Fix 9: hasImplementationArtifacts returns tri-state ──
+
+describe("hasImplementationArtifacts tri-state return", () => {
+  test("returns 'unknown' for non-git directory", () => {
+    const result = hasImplementationArtifacts("/tmp/not-a-git-repo-" + Date.now());
+    assert.strictEqual(result, "unknown");
+  });
+
+  test("return type is one of present/absent/unknown", () => {
+    const result = hasImplementationArtifacts(process.cwd());
+    assert.ok(
+      result === "present" || result === "absent" || result === "unknown",
+      `Expected present/absent/unknown, got: ${result}`,
+    );
+  });
+});
+
+// ── Fix 11: consecutiveCompleteBootstraps is per-session ──
+
+describe("AutoSession.consecutiveCompleteBootstraps", () => {
+  test("initial value is 0", () => {
+    const s = new AutoSession();
+    assert.strictEqual(s.consecutiveCompleteBootstraps, 0);
+  });
+
+  test("reset() clears the counter", () => {
+    const s = new AutoSession();
+    s.consecutiveCompleteBootstraps = 5;
+    s.reset();
+    assert.strictEqual(s.consecutiveCompleteBootstraps, 0);
+  });
+
+  test("two sessions have independent counters", () => {
+    const s1 = new AutoSession();
+    const s2 = new AutoSession();
+    s1.consecutiveCompleteBootstraps = 3;
+    assert.strictEqual(s2.consecutiveCompleteBootstraps, 0);
+  });
+});