Initial project skeleton

Haskell backend: Orb HTTP framework, JSON-only API
Frontend: Mithril.js SPA with TypeScript, Neo Brutalism CSS
Dockerized build via flipstone/haskell-tools image

Routes:
  GET /api/health — health check

Build: ./hs stack build
Test:  ./hs stack test
Run:   ./scripts/run

hs

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# Thin wrapper to run Haskell tooling (stack, hpack, fourmolu, hlint, ...)
+# inside the flipstone/haskell-tools Docker image. Usage: ./hs <cmd> [args]
+# e.g. ./hs stack build, ./hs stack test, ./hs hpack, ./hs fourmolu
+set -euo pipefail
+
+IMAGE="${HAWAT_HASKELL_TOOLS_IMAGE:-ghcr.io/flipstone/haskell-tools:debian-ghc-9.10.3-5d6640d}"
+PROJECT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Named Docker volume shared across all worktrees so cached
+# GHC/dependencies don't need rebuilding per worktree.
+STACK_ROOT_VOLUME="sis-stack-root"
+
+docker volume inspect "${STACK_ROOT_VOLUME}" > /dev/null 2>&1 || \
+  docker volume create "${STACK_ROOT_VOLUME}" > /dev/null
+
+exec docker run --rm -i $([ -t 0 ] && printf -- -t) \
+  -v "${PROJECT_DIR}:/work" \
+  -v "${STACK_ROOT_VOLUME}:/stack-root" \
+  -e STACK_ROOT=/stack-root \
+  -w /work \
+  "${IMAGE}" \
+  "$@"