feat(common): re-export financial_types as FinancialPrice/Quantity/Money/Ratio

Aliased re-exports avoid collision with existing types::Price/Quantity/Money
during migration. Will rename to canonical names in Phase 6 cleanup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

crates/common/src/lib.rs

@@ -82,6 +82,16 @@ pub use ml_strategy::{
     SharedMLStrategy, SimpleDQNAdapter,
 };
 
+// Re-export canonical financial types (aliased to avoid collision with old types:: re-exports)
+// Once migration completes in Phase 6, these become Price/Quantity/Money directly.
+pub use financial_types::{
+    Money as FinancialMoney,
+    Price as FinancialPrice,
+    Quantity as FinancialQuantity,
+    Ratio,
+    SCALE as FINANCIAL_SCALE,
+};
+
 // Re-export regime persistence manager
 pub use regime_persistence::RegimePersistenceManager;