feat(router): add Phase 2 semantic embeddings via @xenova/transformers

.github/workflows/embeddings.yml

@@ -0,0 +1,32 @@
+name: Regenerate Embeddings
+
+on:
+  schedule:
+    - cron: '0 3 * * 0'   # weekly Sunday 03:00 UTC
+  workflow_dispatch:
+
+jobs:
+  regenerate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+
+      - uses: actions/setup-node@39370e3970a6d050c480ffad4ff0ed4d3fdee5af
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - run: npm ci
+
+      - run: npm run build -w @retort-plugins/router
+
+      - name: Regenerate embeddings index
+        run: node packages/router/scripts/generate-embeddings.mjs
+
+      - name: Commit if changed
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add packages/router/data/embeddings.json
+          git diff --staged --quiet || git commit -m "chore(router): regenerate embeddings index [skip ci]"
+          git push