docs: Update SESSION.md with latest checkpoint hash

Author: Jez

SESSION.md

@@ -2,7 +2,7 @@
 
 **Current Phase**: All phases complete! 🎉
 **Current Stage**: Production Ready
-**Last Checkpoint**: df75e37 (2025-11-08)
+**Last Checkpoint**: 44607b1 (2025-11-08)
 **Planning Docs**: `docs/IMPLEMENTATION_PHASES.md`, `docs/DATABASE_SCHEMA.md`
 
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