DEVX-118: fix: configure git identity before commit in sync_wiki

CI environments may lack git user.email/user.name config, causing
git commit to fail with exit code 128. Set identity explicitly before
committing wiki changes.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

src/devx/ci/sync_wiki.py

@@ -208,7 +208,19 @@ def commit_and_push(wiki_dir: Path, wiki_url: str, dry_run: bool) -> bool:
         click.echo(_("No changes to sync — wiki is up to date."))
         return False
 
-    # Commit
+    # Commit — ensure git identity is configured (CI environments may lack it)
+    subprocess.run(  # nosec
+        ["git", "config", "user.email", "devin-ai-integration[bot]@users.noreply.github.com"],
+        cwd=wiki_dir,
+        capture_output=True,
+        check=True,
+    )
+    subprocess.run(  # nosec
+        ["git", "config", "user.name", "Devin CI"],
+        cwd=wiki_dir,
+        capture_output=True,
+        check=True,
+    )
     subprocess.run(  # nosec
         ["git", "commit", "-m", "Sync wiki from docs/ [skip ci]"],
         cwd=wiki_dir,