fix(ci): align wasm target to wasm32v1-none across deploy, docs, and CI

CONTRIBUTING.md

@@ -19,7 +19,13 @@ To build and test the smart contracts, you will need:
 
 - [Rust](https://www.rust-lang.org/tools/install) (latest stable version, at least 1.75+)
 - [Soroban CLI](https://soroban.stellar.org/docs/getting-started/setup#install-the-soroban-cli)
-- `wasm32-unknown-unknown` target: `rustup target add wasm32-unknown-unknown`
+- `wasm32v1-none` target: `rustup target add wasm32v1-none`
+
+> **Note:** This project uses `wasm32v1-none` (not the legacy `wasm32-unknown-unknown`).
+> The `wasm32v1-none` target is required by Soroban SDK v20+ and produces smaller WASM
+> binaries with lower deployment costs. If you are using an older Soroban CLI (< v20),
+> you will need `wasm32-unknown-unknown` instead. CI and local builds must use the same
+> target for artifact compatibility.
 
 ## How Can I Contribute?
 
@@ -55,7 +61,7 @@ Enhancement suggestions are welcome! Please open an issue using the Feature Requ
 Build all contracts to WASM:
 
 ```bash
-cargo build --target wasm32-unknown-unknown --release
+cargo build --target wasm32v1-none --release
 ```
 
 ### Testing

README.md

@@ -65,7 +65,7 @@ Get up and running in minutes:
 
 1.  **Install Prerequisites**:
     ```bash
-    rustup target add wasm32-unknown-unknown
+    rustup target add wasm32v1-none
     cargo install --locked soroban-cli
     ```
 2.  **Clone & Build**:
@@ -146,7 +146,7 @@ ecotask-contracts/
 cargo install --locked soroban-cli
 
 # Add the WebAssembly target
-rustup target add wasm32-unknown-unknown
+rustup target add wasm32v1-none
 ```
 
 ### Build
@@ -157,11 +157,11 @@ git clone https://github.com/ecotask-network/ecotask-contracts.git
 cd ecotask-contracts
 
 # Build all contracts
-cargo build --target wasm32-unknown-unknown --release
+cargo build --target wasm32v1-none --release
 
 # Build a specific contract
 cd contracts/eco-token
-cargo build --target wasm32-unknown-unknown --release
+cargo build --target wasm32v1-none --release
 ```
 
 ### Test
@@ -186,7 +186,7 @@ soroban network add testnet \
 
 # Deploy the ECO token contract
 soroban contract deploy \
-  --wasm target/wasm32-unknown-unknown/release/eco_token.wasm \
+  --wasm target/wasm32v1-none/release/eco_token.wasm \
   --network testnet \
   --source YOUR_SECRET_KEY
 

scripts/deploy.sh

@@ -3,11 +3,11 @@ set -euo pipefail
 
 CONTRACT_NAME="${1:?Usage: deploy.sh <contract-name> <network>}"
 NETWORK="${2:-testnet}"
-WASM="target/wasm32-unknown-unknown/release/${CONTRACT_NAME//-/_}.wasm"
+WASM="target/wasm32v1-none/release/${CONTRACT_NAME//-/_}.wasm"
 
 if [ ! -f "$WASM" ]; then
   echo "Error: WASM file not found at $WASM"
-  echo "Build first: cargo build --target wasm32-unknown-unknown --release -p $CONTRACT_NAME"
+  echo "Build first: cargo build --target wasm32v1-none --release -p $CONTRACT_NAME"
   exit 1
 fi