fix: streamline CI/CD — remove broken AI docs updater, fix Docker publish

- Delete ai-docs-updater.yml (never worked: missing ANTHROPIC_API_KEY, tsx not found)
- Delete standalone docker-publish.yml (GITHUB_TOKEN can't trigger cross-workflow)
- Merge Docker build/push into release.yml as dependent job using .release-version
- Add publishCmd to .releaserc.json to signal new releases to Docker job
- Fix deploy-docs.yml: upgrade pnpm@v3→v4, node 20→22, add --frozen-lockfile
- Fix ci.yml: rename job to "Typecheck" (no lint step existed)

.github/workflows/deploy-docs.yml

@@ -26,16 +26,14 @@ jobs:
         with:
           fetch-depth: 0
       - name: Setup pnpm
-        uses: pnpm/action-setup@v3
-        with:
-          version: 9
+        uses: pnpm/action-setup@v4
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: pnpm
       - name: Install dependencies
-        run: pnpm install
+        run: pnpm install --frozen-lockfile
       - name: Build Docs
         run: pnpm --filter @stirling-image/docs docs:build
       - name: Upload artifact