feat: add Node1 minimum tip amount validation (0.002 SOL)

- Add intelligent tip amount detection for Node1
- Implement MIN_TIP_AMOUNT check in transaction builder
- Add MIN_TIP_AMOUNT.md documentation
- Optimize pumpswap instruction handling
- Update common utility functions

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/instruction/pumpswap.rs

@@ -200,11 +200,13 @@ impl InstructionBuilder for PumpSwapInstructionBuilder {
             data[16..24].copy_from_slice(&token_amount.to_le_bytes());
         }
 
-        instructions.push(Instruction {
+        let buy_instruction = Instruction {
             program_id: accounts::AMM_PROGRAM,
-            accounts,
+            accounts: accounts.clone(),
             data: data.to_vec(),
-        });
+        };
+
+        instructions.push(buy_instruction);
         if close_wsol_ata {
             // Close wSOL ATA account, reclaim rent
             instructions.extend(crate::trading::common::close_wsol(&params.payer.pubkey()));
@@ -375,11 +377,13 @@ impl InstructionBuilder for PumpSwapInstructionBuilder {
             data[16..24].copy_from_slice(&token_amount.to_le_bytes());
         }
 
-        instructions.push(Instruction {
+        let sell_instruction = Instruction {
             program_id: accounts::AMM_PROGRAM,
-            accounts,
+            accounts: accounts.clone(),
             data: data.to_vec(),
-        });
+        };
+
+        instructions.push(sell_instruction);
 
         if close_wsol_ata {
             instructions.extend(crate::trading::common::close_wsol(&params.payer.pubkey()));