TEMPORARY: lazy doubling of fee subtraction

Feels haunted. Adds logging.

crates/bin/pcli/src/command/migrate.rs

@@ -101,7 +101,15 @@ impl MigrateCmd {
                     if value.asset_id == fee.0.asset_id {
                         note_values_2.push(penumbra_asset::Value {
                             asset_id: value.asset_id,
-                            amount: value.amount - fee.0.amount,
+                            // HACK: we are doubling the subtraction of the estimated fee,
+                            // as a temporary workaround for the fee estimation being inaccurate,
+                            // oddly by about 1.9x.
+                            amount: value
+                                .amount
+                                .checked_sub(&fee.0.amount)
+                                .expect("estimated fee is higher than remaining balance 1/2")
+                                .checked_sub(&fee.0.amount)
+                                .expect("estimated fee is higher than remaining balance 2/2"),
                         });
                     } else {
                         note_values_2.push(penumbra_asset::Value {
@@ -128,6 +136,15 @@ impl MigrateCmd {
                 // and spending fees from that account
                 let address_index = AddressIndex::new(0);
 
+                let fee2 = planner_2.compute_fee_estimate(
+                    &gas_prices,
+                    &FeeTier::default(),
+                    &source_address,
+                );
+                println!(
+                    "Estimated fee 2/2 for sending total balance: {:?}",
+                    fee2.0.format(&asset_cache)
+                );
                 let plan = planner_2
                     .memo(memo)
                     .plan(