feat(core-consent): scaffold package with types, IConsent, withConsent brand wrapper

- Add packages/core-consent with ConsentCategory, ConsentState,
  UserConsentState types and IConsent interface
- Add withConsent wrapper attaching __consentChecked brand at bind time;
  unit tests assert brand attachment and factory passthrough
- Add ConsentChecked<F> type to core-shared/conformance/brands.ts and
  isConsentChecked helper to brand-runtime.ts
- Extend FeatureManifest with requiresConsent?: readonly string[] field
- Extend assertFeatureConformance to require __consentChecked brand when
  requiresConsent.length > 0; synthetic fixture tests cover pass/fail cases
- Propagate __consentChecked in withSpan PROPAGATED_BRANDS so the outermost
  binding carries the brand

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

pnpm-lock.yaml

@@ -25,6 +25,9 @@ importers:
       "@types/node":
         specifier: ^22.0.0
         version: 22.19.17
+      "@typescript-eslint/parser":
+        specifier: ^8.25.0
+        version: 8.58.0(eslint@9.39.4(jiti@2.6.1))(typescript@5.9.3)
       fallow:
         specifier: ^2.73.0
         version: 2.73.0
@@ -584,6 +587,31 @@ importers:
         specifier: ^3.0.0
         version: 3.2.4(@types/debug@4.1.13)(@types/node@22.19.17)(happy-dom@20.8.9)(jiti@2.6.1)(jsdom@25.0.1)(lightningcss@1.32.0)(sass@1.99.0)(terser@5.46.2)(tsx@4.21.0)(yaml@2.9.0)
 
+  packages/core-consent:
+    dependencies:
+      "@repo/core-shared":
+        specifier: workspace:*
+        version: link:../core-shared
+    devDependencies:
+      "@repo/core-eslint":
+        specifier: workspace:*
+        version: link:../core-eslint
+      "@repo/core-testing":
+        specifier: workspace:*
+        version: link:../core-testing
+      "@repo/core-typescript":
+        specifier: workspace:*
+        version: link:../core-typescript
+      "@vitest/coverage-v8":
+        specifier: ^3.0.0
+        version: 3.2.4(vitest@3.2.4(@types/debug@4.1.13)(@types/node@25.5.2)(happy-dom@20.8.9)(jiti@2.6.1)(jsdom@25.0.1)(lightningcss@1.32.0)(sass@1.99.0)(terser@5.46.2)(tsx@4.21.0)(yaml@2.9.0))
+      typescript:
+        specifier: ^5.8.0
+        version: 5.9.3
+      vitest:
+        specifier: ^3.0.0
+        version: 3.2.4(@types/debug@4.1.13)(@types/node@25.5.2)(happy-dom@20.8.9)(jiti@2.6.1)(jsdom@25.0.1)(lightningcss@1.32.0)(sass@1.99.0)(terser@5.46.2)(tsx@4.21.0)(yaml@2.9.0)
+
   packages/core-eslint:
     dependencies:
       globals: