perf-agent: Fix formatting and tests

Formatted `perf/perf_agent.py` with black to fix CI `Check formatting` failure.
Ensured `src/tests/test_profile_management.py` uses correct monkeypatching to fix Windows CI `OSError`.

- Formatted perf/perf_agent.py
- Updated src/tests/test_profile_management.py

Co-authored-by: PR0M3TH3AN <[email protected]>

perf/perf_agent.py

@@ -9,9 +9,10 @@ PATTERNS = {
     "Workers": r"new Worker|Worker\(|postMessage\(|getDmDecryptWorkerQueueSize|decryptDmInWorker",
     "WebTorrent": r"new WebTorrent|WebTorrent|torrent|magnet|torrentHash|magnetValidators",
     "Nostr/Relays": r"integrationClient\.pool|publishEventToRelays|pool\.list|queueSignEvent|relayManager|authService|hydrateFromStorage",
-    "Visibility": r"document\.hidden|visibilitychange"
+    "Visibility": r"document\.hidden|visibilitychange",
 }
 
+
 def search_files(directory):
     hits = []
     for root, dirs, files in os.walk(directory):
@@ -31,16 +32,19 @@ def search_files(directory):
                     for i, line in enumerate(lines):
                         for category, pattern in PATTERNS.items():
                             if re.search(pattern, line):
-                                hits.append({
+                                hits.append(
+                                    {
                                         "file": filepath,
                                         "line": i + 1,
                                         "category": category,
-                                    "snippet": line.strip()
-                                })
+                                        "snippet": line.strip(),
+                                    }
+                                )
             except Exception as e:
                 print(f"Error reading {filepath}: {e}")
     return hits
 
+
 def main():
     timestamp = datetime.utcnow().strftime("%Y-%m-%dT%H-%M-%SZ")
     date_str = datetime.utcnow().strftime("%Y-%m-%d")
@@ -78,7 +82,9 @@ Found {len(hits)} performance-relevant code patterns.
     for cat, items in categories.items():
         report_content += f"\n### {cat} ({len(items)} hits)\n"
         for item in items[:5]:  # Limit to 5 examples
-            report_content += f"- `{item['file']}:{item['line']}`: `{item['snippet']}`\n"
+            report_content += (
+                f"- `{item['file']}:{item['line']}`: `{item['snippet']}`\n"
+            )
         if len(items) > 5:
             report_content += f"- ... and {len(items)-5} more.\n"
 
@@ -128,5 +134,6 @@ Daily measurable improvement of app responsiveness.
             f.write("# Initial Performance Baseline\n\nNo historical data available.\n")
         print(f"Baseline saved to {baseline_file}")
 
+
 if __name__ == "__main__":
     main()