fix: redirect Vivado .jou/.log to temp dir with -tempDir

Vivado batch mode creates vivado.jou, vivado.log, and backup files
in cwd by default. Use -tempDir to redirect all temp output to the
system temp directory, and clean up afterwards.

src/zynq_checker.py

@@ -128,11 +128,21 @@ def check_zynq_jtag(
     # ── 3. Run Vivado TCL (stream output to callback) ──────────
     tcl = _build_jtag_query_tcl()
     python_timeout = config.step_timeouts.get("check_env", 120)
-    output_lines: list[str] = []
 
+    # Redirect Vivado journal/log to temp dir so we don't litter the cwd
+    tmp = tempfile.gettempdir()
+    vivado_args = [
+        "-mode", "batch",
+        "-tempDir", tmp,
+        "-journal", str(Path(tmp) / "vivado_jtag.jou"),
+        "-log", str(Path(tmp) / "vivado_jtag.log"),
+        "-source", tcl,
+    ]
+
+    output_lines: list[str] = []
     try:
         proc = subprocess.Popen(
-            build_tool_command(vivado_path, "-mode", "batch", "-source", tcl),
+            build_tool_command(vivado_path, *vivado_args),
             stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
             text=True,
         )
@@ -163,6 +173,12 @@ def check_zynq_jtag(
             Path(tcl).unlink(missing_ok=True)
         except Exception:
             pass
+        # Clean up Vivado temp files we redirected
+        for f in ("vivado_jtag.jou", "vivado_jtag.log"):
+            try:
+                (Path(tmp) / f).unlink(missing_ok=True)
+            except Exception:
+                pass
 
     output = "\n".join(output_lines)