sync: WIN-BOWEI 2026-08-10 硬编码审计：两个 flow driver 的工程根改读 skills_env.md

- run_fpga_local.py: FPGA_FLOW_ROOT 写死 E:\LangGraph_Design\fpga-goldenref-flow
  -> _env_lookup(FPGA_GOLDENREF_ROOT)，未配置时给出明确提示。
- run_imx6_flow.py: DEFAULT_PROJECT 写死 -> _env_lookup(FPGA_IMX6_FLOW_ROOT)，
  --project-dir 为空时报错而不是拿错路径继续。
与 sim-rtl-flow / zynq-imx6-flow 已有写法一致。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

fpga-imx6-flow/scripts/run_imx6_flow.py

@@ -19,6 +19,7 @@ from __future__ import annotations
 import argparse
 import json
 import os
+import re
 import sys
 from pathlib import Path
 
@@ -27,7 +28,30 @@ try:
 except Exception:
     pass
 
-DEFAULT_PROJECT = r"E:\LangGraph_Design\FPGA-imx6-flow"
+
+def _env_lookup(key: str, default: str | None = None) -> str | None:
+    """Read KEY from the OS environment, else from a ``KEY = value`` line in
+    ~/skills_env.md. Machine-local paths are never hardcoded in a skill; see
+    the same helper in fpga_flash/scripts/vivado_env.py."""
+    value = os.environ.get(key)
+    if value:
+        return value
+    path = os.path.join(os.path.expanduser("~"), "skills_env.md")
+    try:
+        with open(path, encoding="utf-8") as handle:
+            for line in handle:
+                match = re.match(rf"\s*{re.escape(key)}\s*=\s*(.+?)\s*(?:#.*)?$", line)
+                if match:
+                    found = match.group(1).strip()
+                    if found and not found.startswith("<"):
+                        return found
+    except OSError:
+        pass
+    return default
+
+
+# The fpga-imx6-flow checkout: FPGA_IMX6_FLOW_ROOT in ~/skills_env.md.
+DEFAULT_PROJECT = _env_lookup("FPGA_IMX6_FLOW_ROOT", "")
 
 
 def _emit(obj: dict, code: int) -> None:
@@ -57,6 +81,11 @@ def main() -> None:
     ap.add_argument("--max-hw-retry", type=int, default=3)
     args = ap.parse_args()
 
+    if not args.project_dir:
+        _emit({"status": "error",
+               "error": "fpga-imx6-flow 工作流仓库路径未配置：在 ~/skills_env.md 增加 "
+                        "FPGA_IMX6_FLOW_ROOT = <检出目录>，或用 --project-dir 显式指定"}, 1)
+
     project = Path(args.project_dir)
     if not (project / "app" / "main_graph.py").exists():
         _emit({"status": "error",