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>

CLAUDE.md

@@ -72,7 +72,7 @@ Every feature has a `src/feature.manifest.ts` declaring its use cases, audits, p
 | **CI drift gate** (`pnpm conformance`) | ~120s   | orphan event consumers across features                                                                      |
 | **Fallow** (`pnpm fallow`)             | ~30–60s | dead exports / unused files; duplicate code; circular deps; complexity hotspots; AI-change audit drift      |
 
-The eight conformance ESLint rules: `feature-must-have-manifest` (error), `usecase-must-have-test-file` (error), `required-cores-installed` (error), `usecase-must-be-wired` (error), `no-undeclared-event-publish` (warn), `no-undeclared-audit` (warn), `no-undeclared-analytics-event` (warn), `pii-declaration-must-be-complete` (warn). Fallow runs as a fifth layer, post-ESLint, whole-codebase.
+The twelve conformance ESLint rules: `feature-must-have-manifest` (error), `usecase-must-have-test-file` (error), `required-cores-installed` (error), `usecase-must-be-wired` (error), `no-undeclared-event-publish` (warn), `no-undeclared-audit` (warn), `no-undeclared-analytics-event` (warn), `pii-declaration-must-be-complete` (warn), `component-must-have-story` (warn), `component-must-have-test` (warn), `atomic-tier-import-direction` (warn), `no-undeclared-consent-check` (warn). Fallow runs as a fifth layer, post-ESLint, whole-codebase.
 
 See `docs/architecture/agent-first-workflow-and-conformance.md` for the full design and `docs/guides/conformance-quickref.md` for the day-to-day reference.