test: E1 carve-guard completeness meta-guard (gate)

Asserts filesystem carved set == CARVE_GUARDS set both directions, so a
future carve without a registry entry fails CI.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

test/carve-guard-completeness.test.ts

@@ -0,0 +1,22 @@
+/**
+ * E1 — carve-guard completeness meta-guard (GATE tier, free).
+ *
+ * Makes the carve gap impossible to reopen: every skill carved on disk (owns a
+ * sections/manifest.json) MUST be in the canonical CARVE_GUARDS registry, and
+ * vice-versa. Because the static (E2) and behavioral (T2) guards are data-driven
+ * FROM the registry, registry membership IS guard coverage — so this set-parity
+ * check is the whole game (codex #2: no need to grep test source). Carve a 7th
+ * skill without a registry entry and this fails CI.
+ */
+
+import { describe, test, expect } from 'bun:test';
+import * as path from 'path';
+import { checkCompleteness } from './helpers/carve-guard-checks';
+
+const ROOT = path.resolve(import.meta.dir, '..');
+
+describe('carve-guard completeness (gate, free)', () => {
+  test('filesystem carved set == CARVE_GUARDS set, and every entry is consistent', () => {
+    expect(checkCompleteness(ROOT)).toEqual([]);
+  });
+});