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>

tests/unit/test_sync_wiki.py

@@ -208,6 +208,8 @@ class TestCommitAndPush:
         mock_run.side_effect = [
             MagicMock(returncode=0),  # git add
             MagicMock(returncode=1),  # git diff --cached --quiet (has changes)
+            MagicMock(returncode=0),  # git config user.email
+            MagicMock(returncode=0),  # git config user.name
             MagicMock(returncode=0),  # git commit
             MagicMock(returncode=0, stdout="", stderr=""),  # git push
         ]
@@ -219,6 +221,8 @@ class TestCommitAndPush:
         mock_run.side_effect = [
             MagicMock(returncode=0),  # git add
             MagicMock(returncode=1),  # git diff --cached --quiet (has changes)
+            MagicMock(returncode=0),  # git config user.email
+            MagicMock(returncode=0),  # git config user.name
             MagicMock(returncode=0),  # git commit
             MagicMock(returncode=1, stdout="", stderr="push failed"),  # git push
         ]