Add build + release GitHub Actions workflows (Phase 6 part 1)

build.yml: npm ci -> gulp lint -> gulp bundle -> upload-artifact
on every push to main and every PR. Reviewers get a one-click
download of a working bundle to preview against any consumer
site without needing a release tag.

release.yml: on every v* tag push, npm ci -> gulp bundle ->
softprops/action-gh-release@v2 with generate_release_notes
+ fail_on_unmatched_files. Auto-publishes build/ui-bundle.zip
to the GitHub release for that tag. workflow_dispatch is
enabled so we can manually republish if the asset upload
fails for infrastructure reasons.

Consumers reference the bundle via:
  https://github.com/SKaiNET-developers/skainet-docs-ui/releases/download/v1.0.0/ui-bundle.zip
  https://github.com/SKaiNET-developers/skainet-docs-ui/releases/latest/download/ui-bundle.zip

Phase 6 part 1 of 2. Part 2 creates the GitHub repo, pushes
all five Phase commits, tags v1.0.0 to trigger the first
release, and opens consumer PRs against mainline SKaiNET
+ SKaiNET-transformers.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: claude

.github/workflows/build.yml

@@ -0,0 +1,40 @@
+name: Build UI bundle
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npx gulp lint
+
+      - name: Build bundle
+        run: npx gulp bundle
+
+      - name: Inspect bundle
+        run: |
+          ls -lh build/ui-bundle.zip
+          unzip -l build/ui-bundle.zip | tail -5
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ui-bundle
+          path: build/ui-bundle.zip
+          if-no-files-found: error

.github/workflows/release.yml

@@ -0,0 +1,35 @@
+name: Publish UI bundle
+
+on:
+  push:
+    tags: ['v*']
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build bundle
+        run: npx gulp bundle
+
+      - name: Publish release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: build/ui-bundle.zip
+          generate_release_notes: true
+          fail_on_unmatched_files: true