fix: use NULL bytes as git log format separators

The git log --graph output uses | characters in the ASCII art,
which conflicts with using | as a format separator. Switch to
NULL bytes (\x00) which won't appear in commit data.

Also removed --graph flag since we build graph data from
parent relationships instead.

apps/api/src/utils/git_history.py

@@ -63,12 +63,11 @@ def get_commit_history(repo_path: str, branch: str | None = None, limit: int = 1
     branches_output = _run_git_command(repo_path, ["branch", "-a", "--format=%(refname:short)"])
     branches = [b.strip() for b in branches_output.strip().split("\n") if b.strip()]
 
-    # Build git log command
+    # Build git log command - use NULL bytes as separators to avoid parsing issues
     log_args = [
         "log",
         "--all",
-        "--graph",
-        f"--format=%H|%P|%an|%ae|%at|%s",
+        "--format=%H%x00%P%x00%an%x00%ae%x00%at%x00%s",
         f"--max-count={limit}",
         f"--skip={offset}",
     ]
@@ -82,13 +81,14 @@ def get_commit_history(repo_path: str, branch: str | None = None, limit: int = 1
     tag_map = _get_tag_map(repo_path)
 
     commits = []
-    graph_lines = log_output.strip().split("\n") if log_output.strip() else []
+    log_lines = log_output.strip().split("\n") if log_output.strip() else []
 
-    for line in graph_lines:
-        if "|" not in line:
+    for line in log_lines:
+        line = line.strip()
+        if not line:
             continue
 
-        parts = line.split("|")
+        parts = line.split("\x00")
         if len(parts) < 6:
             continue