diff --git a/.gitignore b/.gitignore
index b8ccde8b..55c3a25f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,6 +19,8 @@ Thumbs.db
 
 # Runtime Data, Logs, and Databases
 /data/
+# go test cwd=internal/server + relative DATA_DIR writes here by mistake
+internal/server/data/
 logs/
 *.log
 *.sqlite
diff --git a/internal/server/workflow_governance_piagent_pg_test.go b/internal/server/workflow_governance_piagent_pg_test.go
index 1a185db3..88bdf74c 100644
--- a/internal/server/workflow_governance_piagent_pg_test.go
+++ b/internal/server/workflow_governance_piagent_pg_test.go
@@ -266,7 +266,7 @@ func TestWorkflowGovernance_PiAgent_PG_FullChain(t *testing.T) {
 		WfKey:       workflowdef.OfficialKeyMain,
 		TaskKey:     "intake",
 		StageKey:    "V0.1_triage",
-		ProjectName: "PG PiAgent 治理链中文项目",
+		ProjectName: fmt.Sprintf("PG PiAgent 治理链 %d", time.Now().UnixNano()%1_000_000),
 		Materials: []bizdev.MaterialInput{{
 			Filename: "project_brief.md",
 			Content:  []byte("# 项目简报\n\n- 产品：超声软组织手术系统\n- 目标：NMPA III 类注册路径摸底\n- 关键需求：双频刀头、灌注与负压吸引\n"),
@@ -280,7 +280,7 @@ func TestWorkflowGovernance_PiAgent_PG_ProductManager_FullChain(t *testing.T) {
 		WfKey:              workflowdef.OfficialKeyProductManager,
 		TaskKey:            "system_reqs",
 		StageKey:           "requirements_baseline",
-		ProjectName:        "PG PiAgent 产品经理治理链",
+		ProjectName:        fmt.Sprintf("PG PiAgent 产品经理 %d", time.Now().UnixNano()%1_000_000),
 		ExpectPlanningDone: true,
 		Materials: []bizdev.MaterialInput{{
 			Filename: "intake_summary.md",
@@ -295,7 +295,7 @@ func TestWorkflowGovernance_PiAgent_PG_TestManager_FullChain(t *testing.T) {
 		WfKey:              workflowdef.OfficialKeyTestManager,
 		TaskKey:            "test_manager",
 		StageKey:           "system_verification_planning",
-		ProjectName:        "PG PiAgent 测试经理治理链",
+		ProjectName:        fmt.Sprintf("PG PiAgent 测试经理 %d", time.Now().UnixNano()%1_000_000),
 		ExpectPlanningDone: true,
 		Materials: []bizdev.MaterialInput{{
 			Filename: "verification_scope.md",
diff --git a/scripts/run-nightly-real-pi.sh b/scripts/run-nightly-real-pi.sh
index 1a751965..acb530ed 100755
--- a/scripts/run-nightly-real-pi.sh
+++ b/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.