chore: stub regtest.sh + fakewallet.sh dispatchers

Both scripts are placeholders that document the intended dispatcher
shape (up/down/logs/shell). fakewallet.sh is a deliberate no-op for
symmetry — same muscle memory whether the backend is a docker stack
or a constant.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

modules/dev-env/scripts/regtest.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+# regtest.sh — wrapper around a Bitcoin/Lightning regtest docker stack.
+#
+# Mirrors the workflow of `lnbits/legend-regtest-enviroment` (LND + CLN
+# + Eclair + bitcoind + electrs). Cloned to
+# `${dev-env.root}/local/docker/regtest/` by the bootstrap script
+# (later pass); this wrapper just dispatches `up` / `down` / `logs` /
+# `shell` to the underlying docker-compose stack.
+#
+# Symmetric with fakewallet.sh so the dev experience reads the same
+# whether you're on the default FakeWallet path or the regtest stack:
+#
+#   regtest up         # boot the regtest stack
+#   regtest down       # tear it down
+#   regtest logs       # tail compose logs
+#   regtest shell      # drop into a node container
+#
+# Once `regtest up` is healthy, point LNbits at the appropriate
+# backend (LndRestWallet / CoreLightningWallet) by flipping
+# `lnbits-sensei.lnbits.backend` and rebuilding.
+
+set -euo pipefail
+
+# TODO(skeleton): replace with real dispatcher in the substantive pass.
+# Intended shape:
+#   case "${1:-}" in
+#     up)    docker compose -f "${REGTEST_DIR}/docker-compose.yml" up -d ;;
+#     down)  docker compose -f "${REGTEST_DIR}/docker-compose.yml" down ;;
+#     logs)  docker compose -f "${REGTEST_DIR}/docker-compose.yml" logs -f ;;
+#     shell) docker compose -f "${REGTEST_DIR}/docker-compose.yml" exec "${2}" sh ;;
+#     *)     usage ;;
+#   esac
+
+echo "regtest: TODO — substantive implementation lands in a later pass."
+echo "See modules/dev-env/scripts/regtest.sh for the intended dispatcher shape."
+exit 0