[codex] Humanize plugin alert messages

[Pigbibi]

Summary

• rewrite strategy plugin alert i18n so notices answer the operator questions: what happened, whether it is crisis/opportunity, and what to do next
• localize market_regime_notification as a user-facing unified market-regime notification target
• add structured situation/recommendation generation from plugin route/action/reason labels while keeping raw ids in metadata for audit and dedupe

Validation

• PYTHONPATH=src python -m pytest tests/test_strategy_plugins.py
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Honor top-level reason_codes in alert summaries

When a plugin artifact supplies machine reason_codes at the top level (the runtime contract lists them alongside canonical_route and suggested_action), this new fallback never reads them; it only checks log_record.reason_codes and position_control.reason_codes. Those alerts will say no explicit reason provided, so operators lose the trigger reason unless the artifact duplicates the codes into one of these nested sections. Please check payload.get("reason_codes") before the nested fallbacks.

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