[codex] reconcile cloud runtime drift

[Pigbibi]

Summary

• add Schwab single-service Cloud Run traffic reconciler
• replace inline legacy scheduler deletion with whitelist cleanup
• keep existing scheduler/env/plugin workflow behavior covered by tests

Validation

• python3 -m unittest tests/test_reconcile_cloud_runtime.py -v
• bash tests/test_sync_cloud_run_env_workflow.sh
• python3 YAML parse for .github/workflows/sync-cloud-run-env.yml
• git diff --check

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Verify mounts before routing traffic

When the service has traffic pinned to an older revision (the drift this step is correcting), this command moves 100% of production traffic to the latest revision before the following Verify strategy plugin mounts step runs. If the env sync just wrote a bad or missing SCHWAB_STRATEGY_PLUGIN_MOUNTS_JSON, the verification can still fail, but traffic has already been shifted to the unverified revision; run this reconciliation after that verification succeeds.

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