Factory: Deploy method to batch wallet creation and contract call

[alberto-crossmint]

Contract Factory: Deploy-and-Call

Adds atomic deploy-and-call functionality to the contract factory, enabling deployment followed by immediate contract invocations in a single transaction.

Changes

New Function: deploy_and_call

• Accepts deployment arguments plus a vector of ContractCall structs
• Deploys contract idempotently (skips deployment if already exists)
• Executes each call sequentially against specified contracts
• Reverts entire transaction if any call fails (atomicity guarantee)
• Requires deployer role authorization

Refactoring

• Extracted deploy_idempotent_inner as internal helper to avoid duplication
• deploy_idempotent now delegates to this internal function
• Both public functions maintain identical deployment behavior

New Types

• ContractCall: encapsulates target contract address, function name, and arguments

Use Cases

• Initialize contract state immediately after deployment
• Grant permissions or set roles atomically with deployment
• Execute setup sequences that must succeed together
• Predict contract address before deployment and call functions on it

Test Coverage

• Empty calls vector (equivalent to deploy_idempotent)
• Address prediction matches actual deployed address
• Idempotency: second call with same args returns same address without redeployment
• Role enforcement: non-deployers cannot execute
• Self-authorization: deployed contract can authorize calls to itself
• External signer authorization: calls requiring external auth work correctly

Testing Infrastructure

• Added HELLO_WORLD_WASM constant for testing (416 lines of WASM bytecode)
• Extended hello-world contract with hello_requires_auth and is_deployed functions
• Tests cover authorization patterns both with the deployed contract as caller and with external signers