docs(work): scaffold frontend-conformance-v1 epic + story

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

docs/work/frontend-conformance-v1/01-frontend-rules/_story.md

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+---
+id: 01-frontend-rules
+epic: frontend-conformance-v1
+title: Three structural frontend conformance ESLint rules
+type: technical-story
+status: in-progress
+feature: core-eslint
+depends-on: []
+blocks: []
+---
+
+## Goal
+Three new rules under the `conformance/` plugin namespace:
+`component-must-have-story`, `component-must-have-test`,
+`atomic-tier-import-direction`. All ship as WARN initially because
+no components exist in the repo today.
+
+## Done when
+- Three rules registered in `@repo/core-eslint/plugin`
+- Each has RuleTester tests
+- `base.js` registers them at WARN severity
+- `pnpm lint` passes (zero firings expected today; rules activate when
+  first component lands)
+
+## In scope
+- Three new rule files in `packages/core-eslint/rules/`
+- Plugin + base.js wiring
+- Tests via RuleTester
+
+## Out of scope
+- Visual regression infrastructure (Playwright screenshots — separate plan)
+- `story-must-cover-all-prop-variants` advisory rule
+- Detection beyond filesystem siblings (no AST-level component-detection
+  heuristics)
+
+## Tasks
+- [ ] Epic + story scaffold
+- [ ] `component-must-have-story` rule + tests
+- [ ] `component-must-have-test` rule + tests
+- [ ] `atomic-tier-import-direction` rule + tests
+- [ ] Plugin update + base.js wiring
+- [ ] Final verification + closeout