[codex] Clarify runtime route roles

[Pigbibi]

Summary

• add explicit /dry-run alias for strategy dry-run
• keep existing /precheck compatibility route
• make /probe call the read-only session/account check instead of static service health
• update route tests

Validation

• /home/ubuntu/Projects/platform-runtime-work/.venv/bin/python -m pytest tests/test_request_handling.py

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep /probe independent of gated session checks

In deployments or schedulers that still use GET/POST /probe as the lightweight probe, this now forwards to session_check(), so the request returns 403 unless FIRSTRADE_RUN_SESSION_CHECK_ON_HTTP=true and can return 500 if that gate is enabled without broker credentials. The existing /probe contract was an always-available service-health response, and .env.example still defaults the session-check gate to false, so this can make health/scheduler probes report the service as failed even when the app is up; use /session-check for the gated broker check or keep /probe on static health semantics.

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