fix: exact byte pass-through in post-edit-console-warn, add 7 tests

Replace console.log(data) with process.stdout.write(data) in both
pass-through paths to prevent appending a trailing newline that
corrupts the hook output. Add 7 tests covering exact byte fidelity,
malformed JSON, missing file_path, non-existent files, exclusion
patterns in check-console-log, non-git repo handling, and empty stdin.

scripts/hooks/post-edit-console-warn.js

@@ -28,7 +28,7 @@ process.stdin.on('end', () => {
 
     if (filePath && /\.(ts|tsx|js|jsx)$/.test(filePath)) {
       const content = readFile(filePath);
-      if (!content) { console.log(data); return; }
+      if (!content) { process.stdout.write(data); return; }
       const lines = content.split('\n');
       const matches = [];
 
@@ -48,5 +48,5 @@ process.stdin.on('end', () => {
     // Invalid input — pass through
   }
 
-  console.log(data);
+  process.stdout.write(data);
 });