fix(audit): use ASCII-safe JSON output for Windows cp1252 compatibility

Remove ensure_ascii=False from json.dumps calls so Unicode characters
(→, ❌) are escaped as \uXXXX sequences. This prevents UnicodeEncodeError
on Windows where stdout defaults to cp1252 encoding.

Also set PYTHONUTF8=1 in test subprocess environments as a safety net.

Author: CybotTM

audit.py

@@ -404,7 +404,7 @@ def cmd_audit(args: argparse.Namespace) -> int:
             enriched_tools.append(enriched)
 
         # Output JSON array to stdout
-        print(json.dumps(enriched_tools, indent=2, ensure_ascii=False))
+        print(json.dumps(enriched_tools, indent=2))
         return 0
 
     # Table output mode
@@ -1074,7 +1074,7 @@ def cmd_versions(args: argparse.Namespace) -> int:
             "runtimes": runtimes_data,
             "total": len(runtimes_data),
         }
-        print(json.dumps(output, indent=2, ensure_ascii=False))
+        print(json.dumps(output, indent=2))
         return 0
 
     # Table output mode

tests/test_update_fixes.py

@@ -109,6 +109,7 @@ def test_collect_node_generates_versioned_entries(self):
         env["CLI_AUDIT_JSON"] = "1"
         env["CLI_AUDIT_COLLECT"] = "1"
         env["CLI_AUDIT_MERGE"] = "1"
+        env["PYTHONUTF8"] = "1"
 
         result = subprocess.run(
             [sys.executable, "audit.py", "node@25"],
@@ -132,6 +133,7 @@ def test_collect_go_generates_versioned_entries(self):
         env["CLI_AUDIT_JSON"] = "1"
         env["CLI_AUDIT_COLLECT"] = "1"
         env["CLI_AUDIT_MERGE"] = "1"
+        env["PYTHONUTF8"] = "1"
 
         result = subprocess.run(
             [sys.executable, "audit.py", "go@1.25"],
@@ -151,6 +153,7 @@ def test_collect_empty_filter_does_not_crash(self):
         env = os.environ.copy()
         env["CLI_AUDIT_JSON"] = "1"
         env["CLI_AUDIT_COLLECT"] = "1"
+        env["PYTHONUTF8"] = "1"
 
         result = subprocess.run(
             [sys.executable, "audit.py", "nonexistent_tool_xyz"],