Add TODO for CompactionTest flakiness root cause fix

Agent-Logs-Url: https://github.com/github/copilot-sdk-java/sessions/ad5df473-91b8-4a66-a808-a7513cd18c2c

Co-authored-by: edburns <75821+edburns@users.noreply.github.com>

Author: Copilot

pom.xml

@@ -326,6 +326,9 @@
                         This handles intermittent failures in E2E tests (e.g.,
                         CompactionTest) where snapshot matching can be sensitive
                         to non-deterministic compaction behaviour.
+                        TODO: Fix the root cause of CompactionTest flakiness
+                        (snapshot mismatch after compaction) so this retry is
+                        no longer needed.
                     -->
                     <rerunFailingTestsCount>2</rerunFailingTestsCount>
                     <systemPropertyVariables>