chore(tooling): reconcile PI executor branch with current dev

scripts/run-nightly-real-pi.sh

@@ -132,7 +132,20 @@ export RUN_PI_E2E=1
 export KB_REQUIRE_ONLINE="${KB_REQUIRE_ONLINE:-1}"
 # Host Go tests must write workspaces into the same tree the runner mounts
 # (docker-compose.dev.yml: ./data/dev/workspaces → /app/data/workspaces).
+#
+# CRITICAL: `go test ./internal/server/...` runs with cwd=internal/server.
+# A relative DATA_DIR (e.g. ./data/dev from configs/.env.dev) resolves to
+# internal/server/data/dev and diverges from the pi-agent bind mount, so the
+# agent sees an empty workspace (missing template.md / blackboard.json) while
+# PrepareWorkspace wrote a complete tree under the package-local path.
+if [[ -n "${DATA_DIR:-}" && "${DATA_DIR}" != /* ]]; then
+  echo "warning: ignoring relative DATA_DIR=${DATA_DIR}; forcing ${ROOT}/data/dev" >&2
+  DATA_DIR="${ROOT}/data/dev"
+fi
 export DATA_DIR="${DATA_DIR:-${ROOT}/data/dev}"
+# Absolutize even if caller exported a relative path via other means.
+DATA_DIR="$(cd "${DATA_DIR}" 2>/dev/null && pwd -P || echo "${ROOT}/data/dev")"
+export DATA_DIR
 echo "==> DATA_DIR=${DATA_DIR}"
 
 # Shared KB preflight (host :5432). Fail closed unless KB_ALLOW_OFFLINE=1.