feat(tests): EIP-7954 checklist triage and parent initcode-limit transition test

[axiosdevs]

Description

Checklist triage for EIP-7954 (tests/amsterdam/eip7954_increase_max_contract_size), which uv run checklist reported at 0% because none of its 21 tests carried a marker and it had no eip_checklist_not_applicable.txt / eip_checklist_external_coverage.txt.

• Markers on existing tests for what they already pin: opcode/test/execution_context/initcode/behavior{,/tx,/opcode}, opcode/test/out_of_bounds/verify/{max,max_plus_one}, opcode/test/contract_creation/address, opcode/test/gas_usage/extra_gas, opcode/test/fork_transition/at, and modified_transaction_validity_constraint/test/fork_transition/{rejected_before_fork,accepted_after_fork,rejected_after_fork}. Where only one parametrization is the covering case (at_max / over_max of the creation-transaction initcode test) the mark sits on the pytest.param.
• Not applicable: the EIP moves two constants and adds no opcode, precompile, system contract, transaction type, header/body field, gas price or refund rule, so those subtrees are marked with the same wording as the EIP-7976 files; the opcode sub-items that describe CREATE/CREATE2 semantics the EIP does not touch (stack, memory expansion, static context, return data, collisions, …) get one-line reasons each.
• External coverage: opcode-level exact/one-short gas at the new 64 KiB / 128 KiB sizes and the exceptional abort on an over-limit initcode are already pinned by tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_create.py and tests/shanghai/eip3860_initcode/test_initcode.py (which fills at fork.max_initcode_size() on Amsterdam), so the entries point there instead of duplicating them.
• One new test, test_parent_max_initcode_size_across_fork: a create transaction whose initcode is exactly the parent fork's max_initcode_size() is accepted in the pre-fork block and again after the transition — the accepted_before_fork arm of the modified validity constraint, mirroring the existing test_parent_max_code_size_across_fork.

Result: uv run checklist tests/amsterdam/eip7954_increase_max_contract_size → 22/22, no conflicting items. (The template row transaction_type/test/intrinsic_validity/data_floor_above_intrinsic_gas_cost still shows as open on this branch; that is the duplicated-ID artifact fixed in #3544 and goes away once that lands.)

Verification: uv run fill tests/amsterdam/eip7954_increase_max_contract_size --until Amsterdam — 108 passed; ruff check/ruff format, mypy and codespell clean on the touched files.

Related Issues or PRs

Related to the checklist tracking in #3217. Follows the EIP-8246 triage in #3533 for structure.

Checklist

• Ran fast static checks to avoid CI fails, see Code Standards & Verifying Changes: just static
• PR title has the form <type>(<area>): <title>, where <type> and <area> come from an appropriate C-<type>, respectively A-<area>, label. The title should match the target squash commit message.

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[LouisTsai-Csie]

I will close this one since it is duplicated by PR #3546 , which has more test coverage.