feat(core-eslint): add no-undeclared-consent-check rule (conformance gate 12)

Extends the conformance ESLint layer with the consent-check rule:

- `no-undeclared-consent-check` (warn): `consent.isGranted("X")` in a
  use-case file must match a category declared in `manifest.requiresConsent`;
  also warns when requiresConsent is declared but no isGranted call is found.
- `_manifest-ast.js`: adds `parseManifestFully` which extracts top-level
  `name`, `requiredCores`, `requiresConsent`, and per-use-case maps from the
  manifest AST; `requiresConsent` extraction tested in `_manifest-ast.test.js`.
- `_rule-context.js` / `_rule-schema.js`: shared helpers extracted from the
  existing per-rule files so the new rule can resolve use-case name + feature
  root without duplication.
- Existing rules (`no-undeclared-audit`, `no-undeclared-event-publish`,
  `no-undeclared-analytics-event`) updated to use the shared helpers.
- `plugin.js` + `base.js` register the rule at warn severity.
- CLAUDE.md + conformance-quickref.md: rule count advanced from 11 → 12.

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

.fallowrc.json

@@ -40,7 +40,9 @@
     "zod",
     "@eslint/js",
     "@opentelemetry/sdk-node",
-    "@sentry/opentelemetry"
+    "@sentry/opentelemetry",
+    "@stryker-mutator/core",
+    "@stryker-mutator/vitest-runner"
   ],
   "ignoreExportsUsedInFile": true,
   "rules": {