The DEFAULT_MAX_TOKENS_HOT was 8000 (should be 16000),
DEFAULT_MAX_DECISIONS_WARM was 500 (should be 100), and
DEFAULT_MAX_DECISIONS_COLD was 5000 (should be 500). These values in context_tier_settings.py did not match the canonical defaults defined in TierBudget model (tiers.py) or Settings class defaults, causing incorrect budget enforcement when settings were None.
ISSUES CLOSED: #1443