Summary

• Add XOR parameter support for chain_name OR chain_id across get_network_config() and EAS.from_chain()
• Replace network_name with chain_name consistently throughout codebase
• Update CLI to support both --chain-name and --chain-id options
• Add helper functions for chain ID/name conversion

Breaking Changes

• get_network_config() now requires keyword arguments and accepts XOR chain_name/chain_id
• EAS.from_chain() updated to use keyword-only arguments with XOR validation
• CLI --network option replaced with --chain-name and --chain-id
• All network_name parameters renamed to chain_name

Test Plan

• All existing tests updated and passing (115 passed, 13 skipped)
• Type checking passes with MyPy
• Linting passes with Flake8
• Code formatting verified with Black
• XOR validation tested for both API methods
• CLI functionality verified for both parameter types