refactor(test-tests): migrate cancun to osaka gas costs to bytecode.gas_cost(fork)

[spencer-tb]

🗒️ Description

Migrate Cancun, Prague, and Osaka test files from manual fork.gas_costs() / hardcoded Spec constants to bytecode.gas_cost(fork).

This is a pure refactor with no functional change, all exact gas-boundary test fixtures produce identical output (verified via fixture hash comparison).

The benefit is maintainability: tests now declare intent via opcode metadata (e.g., address_warm=False, key_warm=True) and delegate gas calculation to the framework's opcode_gas_map(), so future gas schedule changes only need updating in one place.

Files migrated:

• tests/cancun/eip1153_tstore/test_basic_tload.py
• tests/cancun/eip1153_tstore/test_tstorage.py
• tests/cancun/eip1153_tstore/test_tstorage_execution_contexts.py
• tests/cancun/eip4844_blobs/test_blobhash_opcode.py
• tests/cancun/eip7516_blobgasfee/test_blobgasfee_opcode.py
• tests/prague/eip7702_set_code_tx/test_eip_mainnet.py
• tests/prague/eip7702_set_code_tx/test_gas.py
• tests/prague/eip7702_set_code_tx/test_set_code_txs.py
• tests/prague/eip7702_set_code_tx/test_set_code_txs_2.py
• tests/prague/eip7623_increase_calldata_cost/test_refunds.py
• tests/osaka/eip7823_modexp_upper_bounds/conftest.py
• tests/osaka/eip7825_transaction_gas_limit_cap/test_tx_gas_limit.py
• tests/osaka/eip7883_modexp_gas_increase/conftest.py
• tests/osaka/eip7883_modexp_gas_increase/test_modexp_thresholds_transition.py

Remaining fork.gas_costs() references are intentional:

• Refund constants (R_STORAGE_CLEAR, R_AUTHORIZATION_EXISTING_AUTHORITY), not opcode costs
• Transaction-level costs (G_TX_DATA_FLOOR_TOKEN_COST, G_ACCESS_LIST_ADDRESS, G_ACCESS_LIST_STORAGE), not expressible via bytecode.gas_cost(fork)

🔗 Related Issues or PRs

Partially fixes #2049.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx tox -e static
  

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.07%. Comparing base (a82b1f6) to head (b815d0c).
⚠️ Report is 4 commits behind head on forks/amsterdam.

Additional details and impacted files

@@               Coverage Diff                @@
##           forks/amsterdam    #2191   +/-   ##
================================================
  Coverage            86.07%   86.07%           
================================================
  Files                  599      599           
  Lines                39472    39472           
  Branches              3780     3780           
================================================
  Hits                 33977    33977           
  Misses                4862     4862           
  Partials               633      633           

Flag	Coverage Δ
unittests	86.07% <ø> (ø)

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[marioevz]

Have not reviewed yet but did a push of a commit to remove the Bytecode wrapping.

[marioevz]

Excellent, thanks!