test: add go-test-json baseline support for execution-specs suite

[arner]

Adds a go test -json parser to cmd/baseline (ParseGoTestJSON) and wires up a new eth-tests-execution-specs suite, mirroring the existing OZ Hardhat mocha-json baseline: known failures tracked per-subtest in testdata/eth_known_failures.json instead of a whole-file skip list.

Trims testdata/execution_specs_tests.skip down to only the one file that panics (confirmed via a real run: an unrecovered panic crashes the whole go test process, unsafe for the per-subtest baseline model to represent) -- the other 9 known-bad files now run and their failures are tracked in the baseline instead.

Wires testdata/execution-specs-tests fixture caching, a real (non-suppressed) baseline-check gate, and per-PR execution into the execution-specs-tests CI job.

[codecov]

Codecov Report

❌ Patch coverage is 78.37838% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 25.17%. Comparing base (aaad3b9) to head (b32dbaf).

Files with missing lines	Patch %	Lines
cmd/baseline/main.go	23.07%	10 Missing ⚠️
cmd/baseline/baseline.go	90.16%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #289      +/-   ##
==========================================
+ Coverage   24.80%   25.17%   +0.37%     
==========================================
  Files          74       74              
  Lines       10736    10803      +67     
==========================================
+ Hits         2663     2720      +57     
- Misses       7842     7849       +7     
- Partials      231      234       +3     

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[github-actions]

✅ OZ Hardhat Compatibility — 84.1% passing (4755/5652)

No regressions, no stale entries.

Full breakdown — 4755 passed, 896 failed, 1 skipped (5652 total, 84.1% passing)

By suite

• access: 354/578 passing (61%)
• crosschain: 10/15 passing (67%)
• finance: 0/2 passing (0%)
• governance: 77/185 passing (42%)
• metatx: 0/12 passing (0%)
• proxy: 194/252 passing (77%)
• token: 1637/1852 passing (88%)
• utils: 2483/2755 passing (90%)

Expected failures by cause (896)

• max-code-size: 212
• eth_signTypedData_v4: 165
• execution reverted: 152
• insufficient-funds: 94
• fixed-timestamp: 68
• gas-stub: 36
• hardhat_impersonateAccount: 29
• Expected transaction to be reverted with custom error 'AccessManagerNotScheduled', but it reverted with custom error 'AccessManagerUnauthorizedAccount': 27
• fixed-block-number: 17
• Expected transaction to be reverted without a reason, but it didn't revert: 9
• eth_getProof: 6
• evm_setAutomine: 6
• personal_sign: 5
• Expected transaction to be reverted with custom error 'FailedCall', but it reverted with custom error 'TimelockUnexpectedOperationState': 4
• expected 0 to equal 864000.: 4
• expected 1000180 to equal 1785339388.: 4
• expected false to be true: 3
• hardhat_setStorageAt: 3
• Error in "RoleGranted" event: Error in the 4th argument assertion: expected 1000000 to equal 1785339216.: 2
• Error in "RoleGranted" event: Error in the 4th argument assertion: expected 1000000 to equal 1786548816.: 2
• Expected transaction to be reverted with custom error 'AccessManagerNotScheduled', but it reverted with a different custom error: 2
• Expected transaction to be reverted with custom error 'FailedCall', but it didn't revert: 2
• expected 0 to equal 10.: 2
• expected 1000000 to equal 1785339208.: 2
• expected 1086400 to equal 1785425629.: 2
• expected 1786203210 to equal 1786203209.: 2
• expected 518400 to equal 172800.: 2
• expected Result(2) [ 10000n, 0n ] to deeply equal [ 0n, 10000n ]: 2
• expected Result(2) [ 17n, 9983n ] to deeply equal [ 15n, 9985n ]: 2
• expected Result(2) [ 42n, 9958n ] to deeply equal [ 40n, 9960n ]: 2
• expected Result(2) [ 5000n, 5000n ] to deeply equal [ 0n, 10000n ]: 2
• Error in "RoleGranted" event: Error in the 4th argument assertion: expected 1000000 to equal 1785339217.: 1
• Error in "RoleGranted" event: Error in the 4th argument assertion: expected 1345600 to equal 1785684816.: 1
• Error in "RoleGranted" event: Error in the 4th argument assertion: expected 1345600 to equal 1785684817.: 1
• Expected transaction NOT to be reverted: 1
• Expected transaction to be reverted with custom error 'AccessManagerUnauthorizedCall', but it didn't revert: 1
• Expected transaction to be reverted with custom error 'TimelockUnexecutedPredecessor', but it reverted with custom error 'TimelockUnexpectedOperationState': 1
• Expected transaction to be reverted with panic code 0x01 (Assertion error), but it reverted with a custom error: 1
• expected '0x1685e618cda7b11fca7b27c7bd4d36980ba…' to equal '0xd95ed73cb4091f22c77fc6b8c487f5ff168…': 1
• expected 0 to equal 36000.: 1
• expected 0 to equal 950400.: 1
• expected 1259200 to equal 1785598419.: 1
• expected 1345600 to equal 1785684816.: 1
• expected 1345600 to equal 1785684817.: 1
• expected 1786203210 to equal 0.: 1
• expected 36000 to equal 4919.: 1
• expected 4919 to equal 0.: 1
• expected 9941 to equal 9958.: 1
• expected Result(2) [ 10000n, 0n ] to deeply equal [ 9953n, 47n ]: 1
• expected Result(2) [ 10000n, 10000n ] to deeply equal [ 9962n, 10038n ]: 1
• expected Result(2) [ 10n, 9990n ] to deeply equal [ 0n, 10000n ]: 1
• expected Result(2) [ 42n, 9958n ] to deeply equal [ 0n, 10000n ]: 1
• expected [ false, '0' ] to deeply equal [ true, '0' ]: 1
• failed to revert Store to block 9584: snapshot for block 9584 not found: 1
• invalid argument 1: json: cannot unmarshal hex string of odd length into Go value of type common.Hash: 1
• out of gas: 1
• transaction already pending: 1