Release v3.6.3: bump version, update README and add release notes

Made-with: Cursor

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sol-trade-sdk"
-version = "3.6.2"
+version = "3.6.3"
 edition = "2021"
 authors = [
     "William <byteblock6@gmail.com>",

README.md

@@ -90,14 +90,14 @@ Add the dependency to your `Cargo.toml`:
 
 ```toml
 # Add to your Cargo.toml
-sol-trade-sdk = { path = "./sol-trade-sdk", version = "3.6.2" }
+sol-trade-sdk = { path = "./sol-trade-sdk", version = "3.6.3" }
 ```
 
 ### Use crates.io
 
 ```toml
 # Add to your Cargo.toml
-sol-trade-sdk = "3.6.2"
+sol-trade-sdk = "3.6.3"
 ```
 
 ## 🛠️ Usage Examples

README_CN.md

@@ -90,14 +90,14 @@ git clone https://github.com/0xfnzero/sol-trade-sdk
 
 ```toml
 # 添加到您的 Cargo.toml
-sol-trade-sdk = { path = "./sol-trade-sdk", version = "3.6.2" }
+sol-trade-sdk = { path = "./sol-trade-sdk", version = "3.6.3" }
 ```
 
 ### 使用 crates.io
 
 ```toml
 # 添加到您的 Cargo.toml
-sol-trade-sdk = "3.6.2"
+sol-trade-sdk = "3.6.3"
 ```
 
 ## 🛠️ 使用示例

RELEASE_v3.6.3.md

@@ -0,0 +1,14 @@
+# Release v3.6.3
+
+## Changes from v3.6.2
+
+### Parallel multi-SWQoS submit
+
+- **Transaction builder pool**: Introduced `PARALLEL_SENDER_COUNT` (18) and ensured pool prefill is at least 18, so that when using dedicated sender threads all channels can acquire a builder without waiting or allocating. Prefill is now 64 with a guaranteed minimum of 18.
+- **Async executor**: Documented that builder pool prefill must match the dedicated sender thread count so multi-channel submit never serializes on `build_transaction`.
+- **Executor logging**: Submit timings are no longer sorted before printing (avoids any extra work on the hot path). Log order reflects completion order (first-completed first); the last line is the slowest channel in that batch.
+
+### Other
+
+- Added `docs/ASYNC_EXECUTOR_REVIEW.md`.
+- Minor updates in types, lib, params, and middleware example.