fix(codeql): remove unused preview exe cache

Author: vincentkoc

.agents/skills/autoreview/scripts/autoreview

@@ -338,7 +338,8 @@ def sample_process_metrics(repo: Path, pid: int) -> tuple[float, float, int, str
         try:
             rss_kb += int(fields[1])
         except ValueError:
-            pass
+            # Some ps variants can emit non-numeric RSS for transient child rows.
+            continue
         cpu_seconds += parse_ps_time(fields[2])
     if not states:
         return None

tools/v2_visual_diff.py

@@ -152,14 +152,8 @@ def output_dir(page: PageSpec) -> Path:
 # ---------------------------------------------------------------------------
 
 
-_PREVIEW_EXE_CACHE: Optional[Path] = None
-
-
 def ensure_preview_exe() -> Path:
     """Always run an incremental dotnet build (once per invocation) to pick up code changes, then locate the exe."""
-    global _PREVIEW_EXE_CACHE
-    if _PREVIEW_EXE_CACHE is not None:
-        return _PREVIEW_EXE_CACHE
     proj = repo_root() / "src" / "OpenClaw.SetupPreview" / "OpenClaw.SetupPreview.csproj"
     print("[vv] building OpenClaw.SetupPreview (incremental)...", flush=True)
     result = subprocess.run(
@@ -175,7 +169,6 @@ def ensure_preview_exe() -> Path:
     exe = preview_exe()
     if not exe or not exe.exists():
         raise RuntimeError("dotnet build succeeded but no exe was produced")
-    _PREVIEW_EXE_CACHE = exe
     return exe