Fix git log parsing to split by NUL+newline

- Git log with --pretty=format adds newlines between commits
- Split records by NUL+newline instead of double NUL
- Fixes test failures where only 1 of 3 commits was being parsed

Co-authored-by: Manuel Kießling <manuel@kiessling.net>

Author: cursoragent

src/WorkspaceMgmt/Infrastructure/Adapter/GitCliAdapter.php

@@ -255,8 +255,8 @@ public function getRecentCommits(string $workspacePath, int $limit = 10): array
             return [];
         }
 
-        // Split by double NUL (end of each commit record)
-        $records = explode("\x00\x00", rtrim($output, "\x00"));
+        // Split by NUL+newline (git log adds newlines between commits by default)
+        $records = explode("\x00\n", rtrim($output, "\x00\n"));
         $commits = [];
 
         foreach ($records as $record) {