chore: add Arc Testnet deployment

[McOso]

Summary

• add Arc Testnet (5042002) RPC and Blockscout verification configuration
• add Foundry broadcast artifacts for the Delegation Framework, caveat enforcers, EIP-7702 implementation, and SimpleFactory
• document Arc Testnet as a supported deployment network

Test plan

• Confirm all 43 suite addresses contain code at their canonical deterministic addresses
• Verify all 43 suite artifacts on the Arc Testnet explorer
• Confirm DelegationManager ownership is assigned to the canonical deployer
• Validate verification script syntax and repository diff formatting

Note

Arc Testnet already contained the canonical SCL library and 35 enforcers with bytecode matching the verified reference deployment. The committed broadcasts record the five missing core contracts and two missing constructor-bearing enforcers deployed by this change.

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Note

Low Risk
No on-chain contract source changes; only env documentation and deployment broadcast records for a testnet.

Overview
Adds Arc Testnet (chain ID 5042002) as a supported deployment target by wiring ARC_TESTNET_RPC_URL in .env.example and committing Foundry broadcast JSON for chain 5042002.

The broadcasts record CREATE2 deployments that complete the delegation suite on Arc where most enforcers were already present: DelegationManager, MultiSigDeleGator, HybridDeleGator, EIP-7702 stateless DeleGator, SimpleFactory, plus LogicalOrWrapperEnforcer and NativeTokenPaymentEnforcer (the latter wired to DelegationManager and an equality-check enforcer). Artifacts are duplicated as timestamped runs and run-latest.json under the usual broadcast/Deploy*.s.sol/5042002/ layout.

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