prototype(tui): throwaway TUI information-architecture prototype (ticket #3)

Three structurally different variants (Panes / Pages / Ledger), switchable
live, plus a six-state scenario rotator (steady, warming up, habit changed,
stale, no baseline, paused) driving the ADR-0002 section-13 contract and the
four separate ADR-0003 section-8 service facts. Pause/resume/collect suspend
the TUI and run a polkit stand-in on the real terminal to validate tty
passthrough. Headless smoke test + SVG screenshots included.

prototype/tui-ia/run

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+# PROTOTYPE runner — throwaway, see README.md
+set -euo pipefail
+cd "$(dirname "$0")"
+if [ ! -x .venv/bin/python ]; then
+  if command -v uv >/dev/null 2>&1; then
+    uv venv -q .venv
+    uv pip install -q --python .venv/bin/python -r requirements.txt
+  else
+    python3 -m venv .venv
+    .venv/bin/pip -q install -r requirements.txt
+  fi
+fi
+exec .venv/bin/python tui_prototype.py