chore: cleanup TypeScript, update docs, scripts, Dockerfile

- Delete all frontend TypeScript source (src/, index.html, package.json, etc.)
- Move static assets to frontend/static/ (style.css, manifest.json)
- Update scripts/build and scripts/test (no npm steps)
- Update Dockerfile (no frontend build step)
- Update README.md and AGENTS.md for Hyperbole stack

Dockerfile

@@ -4,17 +4,14 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates curl tini && \
     rm -rf /var/lib/apt/lists/*
 
-# Build timestamp — read at runtime for diagnostics.
 RUN mkdir -p /build && date -u '+%Y-%m-%d %H:%M UTC' > /build/build-time
 
 ADD build/sis-server /usr/local/bin/sis-server
 RUN chmod +x /usr/local/bin/sis-server
 
-# Frontend SPA static files, served by sis-server via --static-dir.
-ADD frontend/dist /usr/local/share/sis/static
+ADD frontend/static /usr/local/share/sis/static
 
 ENTRYPOINT ["/usr/bin/tini", "-s", "--"]
-
 EXPOSE 8080
 
-CMD ["/usr/local/bin/sis-server", "--port", "8080", "--static-dir", "/usr/local/share/sis/static"]
+CMD ["/usr/local/bin/sis-server"]