fix(code-reviews): retry mkdir failures

[alex-alecu]

Summary

• Treat Cloud Agent workspace directory setup failures as retryable infrastructure failures and destroy the bad sandbox before callers retry.
• Preserve sandbox startup failures as the cause on WrapperNotReadyError so existing sandbox-500 recovery can detect ProcessExitedBeforeReadyError-style failures.
• Keep code-review retries marker-driven and one-shot; plain prose errors still do not trigger retry behavior.

Verification

No manual verification performed; this change is backend error propagation and retry classification only.

Visual Changes

N/A

Reviewer Notes

• Sandbox recovery is intentionally structural: httpStatus: 500 causes are classified, while generic HTTP 500 message text alone is not.
• Wrapper startup cause preservation lets the existing prepare-session/code-review retry marker path handle sandbox startup 500s without a new retry policy.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

The final commit (0c72ce3) removes the dead withSandboxInternalServerErrorRecovery export and migrates its single test to use withPreparationInfrastructureRecovery, resolving the previously flagged dead-code issue. No new issues introduced across all reviewed commits.

Files Reviewed (14 files)

• services/cloud-agent-next/src/execution/orchestrator.ts
• services/cloud-agent-next/src/kilo/wrapper-client.ts — ErrorOptions propagation
• services/cloud-agent-next/src/kilo/wrapper-client.test.ts — cause-preservation test
• services/cloud-agent-next/src/persistence/async-preparation.ts
• services/cloud-agent-next/src/router/handlers/session-prepare.ts — structured failure-category logging
• services/cloud-agent-next/src/sandbox-recovery.ts — dead withSandboxInternalServerErrorRecovery removed ✓
• services/cloud-agent-next/src/sandbox-recovery.test.ts — test migrated to withPreparationInfrastructureRecovery ✓
• services/cloud-agent-next/src/session-prepare.test.ts
• services/cloud-agent-next/src/workspace-errors.ts
• services/cloud-agent-next/src/workspace.test.ts
• services/cloud-agent-next/src/workspace.ts
• services/code-review-infra/test/integration/code-review-orchestrator.test.ts

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_{Reviewed by claude-4.6-sonnet-20260217 · 210,528 tokens}

_{Review guidance: REVIEW.md from base branch main}