feat: harden trading SDK examples

2026-07-12 14:35:58 +08:00
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+# Instruction Middleware
+
+[中文](README_CN.md)
+
+Demonstrates implementing `InstructionMiddleware`, installing it in a `MiddlewareManager`, and observing or modifying instructions before submission.
+
+> The example loads `PRIVATE_KEY` and calls `client.buy`. After configuration it can submit a real PumpSwap mainnet transaction.
+
+```bash
+cargo run --package middleware_system
+```
+
+Middleware must preserve signer, account-order, compute-budget, tip, nonce, and transaction-size semantics. Keep latency-sensitive middleware deterministic and free of blocking I/O.