Return typed workflow errors for run-control contention

[chubes4]

Summary

• return typed retryable workflow errors when run-control storage is temporarily unavailable
• classify option-store read, write, transaction, lock, and release failures without swallowing programmer or policy errors
• preserve idempotent request identity across uncertain commits and safely resume terminal delivery through exclusive connection-lifetime claims
• keep stale workers and duplicate live callbacks fenced with truthful public status

Closes #528

Verification

• php tests/workflow-request-controller-smoke.php (35 passed)
• php tests/run-control-option-store-failures-smoke.php (17 passed)
• composer smoke
• composer phpstan
• git diff --check origin/main...HEAD

AI assistance

OpenAI GPT-5.6 Sol via OpenCode general coding and review subagents was used to reproduce the live Intelligence failure, trace the Agents API ownership boundary, implement and independently review the typed-error and recovery contracts, find and correct uncertain-commit and callback-claim edge cases, and run verification. Chris Huber directed the orchestration and remains responsible for the submitted change.