feat(core-consent): extend generator with consent template + fix withCapture brand propagation

- Add consent to CORE_PACKAGE_GENERATORS in turbo/generators/config.ts so
  pnpm turbo gen core-package consent is a valid command (not hand-rollable)
- Create turbo/generators/templates/core-package/consent/ mirroring the
  analytics template shape (AGENTS.md, package.json, tsconfig, turbo, vitest,
  eslint, src/index.ts scaffolds)
- Regenerate packages/core-consent/ from the new template (replaces the
  previous hand-rolled attempt that violated the generator-first rule)
- Add __consentChecked to withCapture PROPAGATED_BRANDS so the brand bubbles
  through the full withSpan→withCapture wrapper chain to the outermost binding
  that assertFeatureConformance reads

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-shared/src/instrumentation/with-capture.ts

@@ -32,6 +32,7 @@ export function withCapture<Args extends unknown[], R>(
     "__instrumented",
     "__audited",
     "__analyzed",
+    "__consentChecked",
   ] as const;
 
   const wrapped: (...args: Args) => Promise<R> = async (...args) => {