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-consent/vitest.config.ts

@@ -1,15 +1,9 @@
 import path from "node:path";
-import { defineConfig, mergeConfig } from "vitest/config";
+import { mergeConfig } from "vitest/config";
 import { nodeVitestConfig } from "@repo/core-typescript/vitest.base.node";
 
-export default mergeConfig(
-  nodeVitestConfig,
-  defineConfig({
-    test: {
-      include: ["src/**/*.test.ts"],
-    },
-    resolve: {
-      alias: { "@": path.resolve(__dirname, "./src") },
-    },
-  }),
-);
+export default mergeConfig(nodeVitestConfig, {
+  resolve: {
+    alias: { "@": path.resolve(__dirname, "./src") },
+  },
+});