docs(stablecoin): reference issues instead of plan names

programs/stablecoin/src/open_position.rs

@@ -79,7 +79,7 @@ pub fn open_position(
         collateral_amount,
         normalized_debt_amount: 0,
         // TODO(#173): read from ctx clock once `open_position` is rebuilt with
-        // the fee-aware flow. Setting 0 keeps Plan 1 a pure refactor.
+        // the fee-aware flow. Setting 0 keeps #156 a pure refactor.
         opened_at: 0,
     });
 

programs/stablecoin/src/withdraw_collateral.rs

@@ -76,7 +76,7 @@ pub fn withdraw_collateral(
     let vault_holding = TokenHolding::try_from(&vault.account.data)
         .expect("Vault account must hold a valid TokenHolding");
     // The vault PDA is verified to belong to this position, so its holding's
-    // definition is the authoritative collateral definition. Plan 1 dropped the
+    // definition is the authoritative collateral definition. #161 dropped the
     // redundant copy from `Position`; `ProtocolParameters` owns the global
     // collateral definition from #173 onward.
     let collateral_definition_id = vault_holding.definition_id();