[TEST-01] Add missing tests from [CLI-01, SIGN-01, API-01]

[linear-code]

Why

The first Gate A implementation PRs intentionally separated a coherent cross-cutting test set from CLI-01, SIGN-01, and API-01. This issue owns those missing tests without reopening the completed implementation scopes.

Readiness

• syncing to ready across polls
• EL offline to ready
• non-ok response followed by success
• unreachable request followed by success
• abort during sleep unwinds cleanly
• optimistic execution produces the agreed diagnostic while preserving the reviewed readiness behavior
• node-version lookup failure remains non-fatal
• an unknown configured key remains inert and retries with cancellation
• a Builder deposited or activated after startup becomes usable without restarting the sidecar

Identity and BN errors

• happy path returns the Builder index
• BN non-ok response reports bounded, redacted status and useful response detail
• empty successful response is distinct from a BN failure
• non-active status reports the returned status
• version mismatch reports bounded expected and received values
• status lookup failure returns the current reviewed inert/failure result
• genesis-wait failures use the reviewed log level and stack-trace behavior

BuilderStatusTracker

• status and balance are undefined before the first successful poll
• first successful poll stores values without an incorrect status-change warning
• balance-only changes update the balance without a status-change diagnostic
• real status changes produce the agreed diagnostic
• failed status lookup preserves the prior known values

CLI

• malformed execution fee recipient is rejected
• zero execution fee recipient is rejected
• valid fee recipient parses to 20 bytes
• unscheduled Gloas configuration is rejected using the final shared fork-epoch source

Done when

The missing Gate A lifecycle, readiness, cancellation, diagnostic, identity, tracker, and CLI cases pass against the merged implementation, with each REVIEW-01 behavior represented by a focused regression where applicable.

Evidence

• Source implementation: Lodestar PR #9781
• Head audited on 10 August 2026: ce6e28d47d7d1ac81b64be8e2709118e73d6593c
• Existing identity coverage: packages/builder/test/unit/identity.test.ts
• Existing tracker coverage: packages/builder/test/unit/services/builderStatusTracker.test.ts
• Review implementation: REVIEW-01
• Existing signer and keystore coverage: Lodestar PR #9758

[linear-code]

LOD-45