Switch CI to hive-builder-9 and fix reputation determinism

CI Changes:
- Switch data-cache-storage jobs from hive-builder-5 to hive-builder-9
  (40% faster sync due to better single-thread performance)
- Remove GIT_STRATEGY: none from sync job to allow repo clone

Submodule Update (reputation_tracker):
- Use cursor-based iteration for deterministic reputation calculation
- The CTE ORDER BY clause doesn't guarantee execution order, causing
  non-deterministic scores when multiple votes affect the same author