feat(specs,tests): implement eip-7904 gas repricing

.cursorignore

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+# Dependencies and environment folders
+node_modules/
+.venv/
+venv/
+__pycache__/
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.cache/
+
+# Build and output directories
+build/
+dist/
+develop-eggs/
+downloads/
+eggs/
+.eggs/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# Python compiled files
+*.py[cod]
+*$py.class
+*.so
+
+# IDE and editor files
+.vscode/
+.idea/
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Temporary files
+*.tmp
+*.temp
+*.manifest
+*.spec
+
+# Logs and cache
+logs/
+*.log
+*.log.*
+cached_downloads/
+.coverage
+.coverage.*
+htmlcov/
+
+# Documentation build artifacts
+doc/_autosummary
+doc/diffs
+doc/autoapi
+docs/
+
+# Test fixtures and generated files (LARGE - 11GB+)
+tests/execution-spec-generated-tests/
+tests/fixtures/
+tests/t8n_testdata/
+tests/json_infra/fixtures/
+fixtures/
+
+# Large static data files
+*.csv
+*.tsv
+*.json.gz
+*.sqlite
+*.db
+*.zip
+*.tar.gz
+*.tar.bz2
+*.txt.bz2
+
+# AI and temporary folders
+.claude/
+
+# Temporary files in root
+temp.txt
+*.bak
+
+# Tox environment (LARGE - 164MB+)
+.tox/
+
+# Package lock files (keep pyproject.toml but ignore lock files if not needed)
+# uv.lock  # Uncomment if you want to ignore the lock file
+
+# Large binary files
+*.bin
+*.exe
+*.dll
+*.so
+*.dylib
+
+# OS generated files
+Thumbs.db
+ehthumbs.db
+Desktop.ini

src/ethereum/forks/amsterdam/__init__.py

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+"""
+The Amsterdam fork ([EIP-7607]) includes networking changes (peerDAS), increases
+the gas cost while limiting the input size of the `MODEXP` precompile, limits
+the maximum gas per transaction, raises the blob base fee to always be above
+the execution cost, limits the RLP-encoded size of blocks, introduces a count
+leading zeros (`CLZ`) instruction, and adds a new precompile supporting the
+secp256r1 curve.
+
+### Notices
+
+- [EIP-7935: Set default gas limit to 60M][EIP-7935]
+
+### Changes
+
+- [EIP-7594: PeerDAS - Peer Data Availability Sampling][EIP-7594]
+- [EIP-7823: Set upper bounds for MODEXP][EIP-7823]
+- [EIP-7825: Transaction Gas Limit Cap][EIP-7825]
+- [EIP-7883: ModExp Gas Cost Increase][EIP-7883]
+- [EIP-7918: Blob base fee bounded by execution cost][EIP-7918]
+- [EIP-7934: RLP Execution Block Size Limit][EIP-7934]
+- [EIP-7939: Count leading zeros (CLZ) opcode][EIP-7939]
+- [EIP-7951: Precompile for secp256r1 Curve Support][EIP-7951]
+- [EIP-7892: Blob Parameter Only Hardforks][EIP-7892]
+- [EIP-7642: eth/69 - history expiry and simpler receipts][EIP-7642]
+- [EIP-7910: eth_config JSON-RPC Method][EIP-7910]
+
+### Upgrade Schedule
+
+| Network | Timestamp    | Date & Time (UTC)       | Fork Hash    | Beacon Chain Epoch |
+|---------|--------------|-------------------------|--------------|--------------------|
+| Holesky | `1759308480` | 2025-10-01 08:48:00     | `0x783def52` | `165120`           |
+| Sepolia | `1760427360` | 2025-10-14 07:36:00     | `0xe2ae4999` | `272640`           |
+| Hoodi   | `1761677592` | 2025-10-28 18:53:12     | `0xe7e0e7ff` |  `50688`           |
+| Mainnet | `1764798551` | 2025-12-03 21:49:11     | `0x5167e2a6` | `411392`           |
+
+### Releases
+
+[EIP-7607]: https://eips.ethereum.org/EIPS/eip-7607
+[EIP-7594]: https://eips.ethereum.org/EIPS/eip-7594
+[EIP-7823]: https://eips.ethereum.org/EIPS/eip-7823
+[EIP-7825]: https://eips.ethereum.org/EIPS/eip-7825
+[EIP-7883]: https://eips.ethereum.org/EIPS/eip-7883
+[EIP-7918]: https://eips.ethereum.org/EIPS/eip-7918
+[EIP-7934]: https://eips.ethereum.org/EIPS/eip-7934
+[EIP-7935]: https://eips.ethereum.org/EIPS/eip-7935
+[EIP-7939]: https://eips.ethereum.org/EIPS/eip-7939
+[EIP-7951]: https://eips.ethereum.org/EIPS/eip-7951
+[EIP-7892]: https://eips.ethereum.org/EIPS/eip-7892
+[EIP-7642]: https://eips.ethereum.org/EIPS/eip-7642
+[EIP-7910]: https://eips.ethereum.org/EIPS/eip-7910
+"""  # noqa: E501
+
+from ethereum.fork_criteria import Unscheduled
+
+FORK_CRITERIA = Unscheduled(order_index=0)