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The designator is 0xef0100 followed by the delegate address, 23 bytes. is_code_delegated() only checked the prefix, and get_delegate_address() copied a 23-byte window so longer code looked like a delegation and shorter code yielded a partial address. Check the size in both, reading one byte past the designator so a longer code is detected without an extra host call. The state test loader keeps its size diagnostic by checking the magic separately. Fixes ipsilon#1494
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is_code_delegated() only checked for the 0xef0100 prefix, and get_delegate_address() copied a 23 byte window, so code longer than the designator was treated as a delegation and code shorter than it produced a partial delegate address. Both now require exactly 23 bytes, and the address lookup reads one byte past the designator so a longer code is caught without a separate code size call. The state test loader keeps its "invalid size" message by checking the magic on its own.
New evm fixture tests cover the 3, 22, 23 and 24 byte cases on the CALL path. They live in their own file because the state_transition fixture validates the prestate and rejects those codes up front, which is the right behaviour for fixtures.
Fixes #1494