feat: add landing page (LoopTech-branded, Socratic-TA style) + PyPI release workflow

- docs/index.html: GitHub Pages landing page matching Socratic TA's style
  (centered bordered column, light/dark, Oswald + Inter, indigo accent),
  embeds the LoopTech logo and red->indigo brand gradient
- .github/workflows/release.yml: build + publish to PyPI on version tags (OIDC)

Author: ebeckner-looptech

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: Release
+
+# Build and publish to PyPI when a version tag is pushed (e.g. v0.1.0).
+# Uses PyPI Trusted Publishing (OIDC) — configure the trusted publisher for this
+# repo at https://pypi.org/manage/account/publishing/ ; no API token needed.
+
+on:
+  push:
+    tags: ["v*"]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    environment: pypi
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+      - name: Build distributions
+        run: uv build
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1