[codex] Document plugin alert routing boundary

[Pigbibi]

Summary

• document that dedicated plugin-alert bots publish manual-review and notification-only signals
• clarify that strategy-applied defend/delever routes should be notified by the strategy run

Validation

• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Use the machine route codes in alert guidance

In the unified market_regime_control payload, defend and delever are suggested-action values, while the routable codes for automated position impact are risk_off and risk_reduced in market_regime_control_plugin.py. If an alert bot or strategy integration follows this boundary and filters on route=defend/route=delever, defense signals such as risk_off can be misclassified or fail to hand off notification ownership to the strategy run that actually applies the position impact.

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