feat: initial F∆I Law-Heatmap Phase 0 scaffold

First end-to-end-buildable cut of the pflicht-/graph-basierte
Wirkungsanalyse von Rechtsnormen, running on Ch∆In. Demo runs
without external dependencies and without a hub connection so
the methodology + UI stack can be reviewed before any Verbands-
Kooperation or Beirats-Validierung kicks in.

Tree layout

  MACHBARKEITSSTUDIE.md       v0.3 — pflicht-basierte Methodik,
                              4-Tier-Evidenz, 8 law*-Module
                              auf Ch∆In statt der alten F∆I-
                              Plattform.
  RUN.md                      one-page how-to-run.
  flows/durchstich-gewo-14.yaml
                              vertical Phase-0 flow: pull →
                              normalize → duties → citations →
                              cohort → skm → frust → benefit →
                              attribution → system.approval.
  app/                        Flutter macOS client, design
                              language pulled from fai_web
                              (ink #08090A, paper #F4F3EF,
                              petrol signal #2E8F9E). Mock
                              repository ships five fixture
                              norms with real source URLs and a
                              permanent T4 demo-banner so no
                              figure can be mistaken for a
                              validated one.

Module repos (separate, see chain-modules*/):

  text-akoma-normalize, text-deontic-extract, graph-citation-
  extract, text-readability-score, stats-cohort-size, graph-
  shapley-attribution, econ-skm-score, law-benefit-score.

What runs today

  - flutter analyze: 0 issues
  - flutter test: 2/2 (landing + nav-to-shell smoke)
  - flutter build macos (via app/build-macos.sh) and ad-hoc
    codesign, app launches and the Dart VM service comes up
  - native cargo test green on every module
  - cargo build --release --target wasm32-wasip2 produces a
    130 KiB artefact for text-akoma-normalize

What is deliberately mock / stub

  - gRPC wire from the client to a chain serve hub (Repository
    abstraction is in place; live impl is the next step)
  - NKR Bürokratiekosten-Datenbank ingestion (for the canonical
    h-Werte that close out the Engpass per Studie §6.7)
  - DESTATIS GENESIS-API adapter for stats.cohort_size

License: Apache-2.0. Author/contact in MACHBARKEITSSTUDIE.md.
Signed-off-by: flemming-it <sf@flemming.it>

app/setup.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+# Setup script for the F∆I Law-Heatmap Flutter client.
+#
+# Idempotent — safe to re-run. Performs the steps that a fresh
+# checkout needs before `flutter run -d macos` works:
+#
+#  1. Download SIL-OFL fonts (Space Grotesk, Inter, JetBrains Mono)
+#     from the upstream google/fonts repo into assets/fonts/.
+#  2. Clear macOS extended attributes (curl + iCloud-Drive tag
+#     `com.apple.provenance`) that break Apple's CodeSign step.
+#  3. Resolve packages.
+
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+mkdir -p assets/fonts
+
+fetch() {
+  local url=$1 out=$2
+  if [ -s "assets/fonts/$out" ]; then
+    echo "  font already present: $out"
+    return
+  fi
+  echo "  fetching: $out"
+  curl -fsSLo "assets/fonts/$out" "$url"
+}
+
+echo "[1/3] Fonts (SIL OFL, redistribution allowed)"
+fetch "https://github.com/google/fonts/raw/main/ofl/spacegrotesk/SpaceGrotesk%5Bwght%5D.ttf"     "SpaceGrotesk[wght].ttf"
+fetch "https://github.com/google/fonts/raw/main/ofl/inter/Inter%5Bopsz%2Cwght%5D.ttf"            "Inter[opsz,wght].ttf"
+fetch "https://github.com/google/fonts/raw/main/ofl/jetbrainsmono/JetBrainsMono%5Bwght%5D.ttf"   "JetBrainsMono[wght].ttf"
+
+echo "[2/3] Strip extended attributes"
+xattr -cr assets/ 2>/dev/null || true
+xattr -cr macos/ 2>/dev/null || true
+xattr -cr . 2>/dev/null || true
+
+echo "[3/3] Resolve Flutter packages"
+flutter pub get
+
+echo "done — try:  flutter run -d macos"