Drop legacy runtime routes

[Pigbibi]

Summary

• remove legacy root and /precheck strategy entrypoints in favor of /run and /dry-run
• point Cloud Scheduler dry-run jobs at /dry-run while keeping existing scheduler job names
• rename dry-run runtime logs away from precheck wording

Tests

• ../.venv/bin/python -m pytest tests/test_request_handling.py
• bash tests/test_sync_cloud_run_env_workflow.sh

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Update heartbeat matching before switching jobs to /run

When the scheduler sync rewrites the main job to ${service_url}/run, the scheduler-aware heartbeat no longer recognizes that job: scripts/execution_report_heartbeat.py only treats scheduler URIs with path / as strategy-run jobs and then includes a service when no matching job is found. For less-frequent targets such as monthly services, this makes every configured service look due on every heartbeat run, causing false missing-report alerts/failures even on days the main scheduler did not run. Update the heartbeat matcher to accept the new /run path as part of this route migration.

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