Code Review

This PR bundles two independent fixes — a security hardening in the auth flow and a semantic cleanup of execution statuses. Both are well-reasoned. Some observations below.

aggregator/auth.go — zero-address defense

The three-layer guard (GetSignatureFormat → GetKey → verifyAuth) is the right defense-in-depth approach. A few notes:

Minor: redundant conversion in GetSignatureFormat

// auth.go:332 area
if common.HexToAddress(walletAddress) == (common.Address{}) {

walletAddress was already validated by common.IsHexAddress just above and is never used again in this function. Consider saving to a named variable (matching the style of GetKey's ownerAddress) so the intent is clearer, though this is cosmetic.

Tests are solid — TestVerifyAuth_RejectsZeroAddressSubject correctly simulates the real bypass path by minting a JWT with authkey metadata, which matches how the actual auth path works. Good coverage of all three injection points.

core/taskengine/vm.go — PARTIAL_SUCCESS removal

The conceptual change is correct: branch skips are expected behavior, not warnings. Collapsing "some failed" and "all failed" into a single FAILED status is cleaner. A few things worth flagging:

1. ExecutionError is dead code in the result analysis path

AnalyzeExecutionResult never returns ExecutionError — the constant is defined in the iota but only appears in convertToExecutionStatus. The actual ERROR status is set directly on execution.Status in executor.go:668 and engine.go:3096, bypassing convertToExecutionStatus entirely:

// executor.go:668
execution.Status = avsproto.ExecutionStatus_EXECUTION_STATUS_ERROR

So case ExecutionError in convertToExecutionStatus (vm.go:3330) is unreachable. This isn't a runtime bug, but it creates a misleading API — a caller reading AnalyzeExecutionResult's return type would expect to handle ExecutionError but never actually receives it. Options:

• Remove ExecutionError from the ExecutionResultStatus iota and document that ERROR is set only on the proto status directly, OR
• Have AnalyzeExecutionResult return ExecutionError when len(v.ExecutionLogs) == 0 (currently returns ExecutionFailed), reserving that path for the system-level case

2. Silently ignored failed steps with empty error messages

// vm.go:3241
if !step.Success && step.Error != "" {
    failedStepNames = append(failedStepNames, getStepDisplayName(step))
}

A step with success=false and step.Error == "" is neither counted as failed nor as successful — it's invisible to AnalyzeExecutionResult. If any node can produce success=false with an empty error string (e.g., a soft failure with no message), the overall status will be SUCCESS even though a step didn't succeed. Worth verifying this can't happen, or changing the condition to !step.Success only.

3. switch resultStatus blocks have no ExecutionError case

In engine.go (~line 3073) and executor.go (~line 652), the switch only handles ExecutionSuccess and ExecutionFailed. If ExecutionError were ever returned by AnalyzeExecutionResult in the future, it would silently fall through without logging. A default case with a warning log would make this more robust.

core/taskengine/vm_runner_rest.go — email notification

The switch resultStatus blocks at lines ~923 and ~941 have no default or ExecutionError case. Since resultStatus in this function is set only from the local failed bool (only ever ExecutionSuccess or ExecutionFailed), ExecutionError is unreachable here. No bug, but a default guard would make that explicit.

pkg/erc4337/preset/builder_execution_success_test.go

The withdrawalAmount.Sign() > 0 guard is reasonable for a flaky integration test, but the else branch only logs — it doesn't call t.Skip(). This means the test passes silently if the precondition isn't met, giving false confidence in CI. Consider:

} else {
    t.Skip("balance already below reserve; skipping withdrawal test")
}

Proto changes

Reserving value 4 with both reserved 4; and reserved "EXECUTION_STATUS_PARTIAL_SUCCESS"; is correct practice. The generated avs.pb.go correctly reflects this. The migration doc (docs/changes/0001-execution-status-redesign.md) is clear and well-structured — the table format is a nice touch.

Summary

The core logic is sound. The two items worth a follow-up before merging to main are the ExecutionError dead-code confusion and the step-failure filter condition.