chore: promote staging to main — 3 new health dimensions + 4 bug fixes

Features: CEM-Source Fidelity analyzer, Slot Architecture analyzer, Naming Convention Consistency analyzer, Cross-Library Benchmark Suite. Bug fixes: carousel event, skeleton/spinner drift, tabs drift, CEM sync gate. 14-dimension scoring model complete.

Author: himerus

.changeset/carousel-event-fix.md

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+---
+'helixir': patch
+---
+
+fix: correct CEM carousel event name from hx-slide-change to hx-slide

.changeset/cem-source-fidelity.md

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+---
+'helixir': minor
+---
+
+feat: add CEM-Source Fidelity analyzer to cross-reference CEM declarations against actual source code

.changeset/cem-sync-gate.md

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+---
+'helixir': minor
+---
+
+feat: add automated CEM sync CI gate to prevent stale published manifests

.changeset/cross-library-benchmark.md

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+---
+'helixir': minor
+---
+
+feat: add cross-library benchmark suite to validate scorer against 11 real WC libraries and generate helix report

.changeset/fix-skeleton-spinner-type-drift.md

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+---
+'helixir': patch
+---
+
+fix: correct HxSkeletonAttributes and HxSpinnerAttributes property drift in helix.d.ts

.changeset/fix-tabs-type-drift.md

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+---
+'helixir': patch
+---
+
+fix: correct HxTabsAttributes properties drift from CEM

.changeset/naming-consistency-analyzer.md

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+---
+'helixir': minor
+---
+
+feat: add Naming Consistency analyzer to measure library-wide naming convention adherence

.changeset/skeleton-spinner-drift.md

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+---
+'helixir': patch
+---
+
+fix: correct HxSkeletonAttributes and HxSpinnerAttributes property drift from CEM

.changeset/slot-architecture-analyzer.md

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+---
+'helixir': minor
+---
+
+feat: add Slot Architecture analyzer to score slot documentation, type constraints, and slot-property coherence

.github/workflows/cem-validate.yml

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+name: CEM Validate
+
+on:
+  push:
+    branches: [main, dev, staging]
+  pull_request:
+    branches: [main, dev, staging]
+
+jobs:
+  cem-validate:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: '>=9'
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Regenerate CEM from source
+        run: pnpm run cem:generate
+
+      - name: Verify CEM is up to date
+        run: |
+          if ! git diff --exit-code custom-elements.json; then
+            echo "::error::custom-elements.json is stale. Run 'pnpm run cem:generate' locally and commit the updated file."
+            exit 1
+          fi