Add execution report heartbeat alerts

[Pigbibi]

Summary

• add an Execution Report Heartbeat workflow that checks recent runtime report JSON instead of Cloud Run request success
• filter reports by platform/service so shared report buckets cannot mask a missing service report
• document setup and behavior in English and Chinese

Validation

• python -m py_compile scripts/execution_report_heartbeat.py
• real read-only GCS smoke with Telegram disabled
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Tighten the default heartbeat window

With the scheduled job running only once per weekday at 23:25 UTC, the 36-hour default can let yesterday's accepted report satisfy today's check. For example, if the PAPER/US service wrote a report after Monday's close and then misses all Tuesday scheduler runs, Tuesday's heartbeat still finds that report within 36 hours and returns OK, so the missed daily completion is not alerted. Use a window that cannot include the prior trading day's completion, or derive the expected window per market/day.

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