paid: --case plan-eng-review-artifact selects its PTY test by its registered name

A local --case run matched 0 tests (no spend): the PTY test's Bun name is
not its case id, and CASE_TEST_NAMES had no label for it.

scripts/lib/paid-cases.ts

@@ -86,6 +86,7 @@ export const CASE_TEST_NAMES: Record<string, string> = {
   'cso-diff-mode': '/cso --diff records its base and investigates changed security paths',
   'cso-infra-scope': '/cso --infra finds an attacker-to-credential execution path',
   'plan-ceo-review-plan-mode': 'first terminal outcome is asked (Step 0 fires before any plan write)',
+  'plan-eng-review-artifact': 'an interactive review writes one QA test plan about the reviewed change',
 };
 
 export const CASE_KEY_SEPARATOR = '#';