test: one owner per case id, a structural devex 0B setup rule, and correct design/gbrain actors

- plan-design-review-plan-mode was registered by two files; the PTY smoke is
  now plan-design-review-plan-mode-smoke, and a registry test requires one
  owner per case in case-sharded files.
- plan-devex-finding-floor: the template's 0B narrative-confirmation question
  is classified as setup structurally instead of timing out a Haiku assessor.
- setup-gbrain-remote: the actor accepted 'skip' on the MCP-registration
  question the test asserts; it now accepts that question and declines others.
- design-review-plugin-handoff: the fake engine cited a file absent from the
  fixture repo and index.html linked a missing styles.css.
Captured-question regressions with negative controls; each case passed a
focused paid run.

test/qa-supervision-selection.test.ts

@@ -2,7 +2,7 @@ import { expect, test } from 'bun:test';
 import { E2E_TOUCHFILES, selectTests } from './helpers/touchfiles';
 
 const ptyIds = [
-  'plan-ceo-review-plan-mode', 'plan-eng-review-plan-mode', 'plan-design-review-plan-mode',
+  'plan-ceo-review-plan-mode', 'plan-eng-review-plan-mode', 'plan-design-review-plan-mode-smoke',
   'plan-devex-review-plan-mode', 'plan-mode-no-op', 'office-hours-auto-mode',
   'auto-decide-preserved', 'plan-ceo-mode-routing', 'plan-design-with-ui-scope', 'plan-eng-finding-floor',
   'auq-format-gate', 'carve-section-loading', 'office-hours-section-loading', 'office-hours-design-draft', 'plan-ceo-section-loading', 'ship-section-loading',