diff --git a/.config/wt.toml b/.config/wt.toml
new file mode 100644
index 00000000..ce94091e
--- /dev/null
+++ b/.config/wt.toml
@@ -0,0 +1,3 @@
+# Worktrunk project configuration. See https://worktrunk.dev/config/.
+# Install Node deps when a new worktree is created.
+pre-start.yarn-install = "yarn install --immutable"
diff --git a/package.json b/package.json
index 5e2de898..e1757e62 100644
--- a/package.json
+++ b/package.json
@@ -180,6 +180,7 @@
   },
   "scripts": {
     "start": "rollup -c --watch",
+    "deployment-update": "./scripts/deployment-update-symlink.sh",
     "build": "yarn run lint && yarn run rollup",
     "docs": "docsify serve ./docs",
     "docs-check-links": "docker run --init --rm -v \"$(pwd):/input\" -w /input lycheeverse/lychee --config lychee.toml \"./docs/\"",
diff --git a/scripts/deployment-update-symlink.sh b/scripts/deployment-update-symlink.sh
new file mode 100755
index 00000000..76953636
--- /dev/null
+++ b/scripts/deployment-update-symlink.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+#
+# `yarn deployment-update` — point the manual-test Home Assistant instance at
+# this worktree.
+#
+# Repoints the `$ACC_LIVE_LINK` symlink (the dev static server's document root)
+# at this worktree's `dist/`. HA loads the card from a fixed URL served off that
+# static server, so switching worktrees is just this one symlink hop.
+set -euo pipefail
+
+if [[ -z "${ACC_LIVE_LINK:-}" ]]; then
+  echo "ACC_LIVE_LINK is not set — point it at the symlink to update." >&2
+  exit 1
+fi
+
+TARGET="$PWD/dist"
+mkdir -p "$(dirname "$ACC_LIVE_LINK")"
+ln -sfn "$TARGET" "$ACC_LIVE_LINK"
+
+echo "Advanced Camera Card → $TARGET"
+[[ -d "$TARGET" ]] || echo "(no dist/ here yet — run \`yarn start\` to build it)"