Plugins could only see a cron run as the task_id string `cron:<job>:<execution>`,
with no way to tell a scheduled fire from a manual `hermes cron run`. A
security plugin that may only act inside a real scheduled occurrence had
nothing to check.
The scheduler now binds a frozen CronExecution (job id/name, execution id,
source, scheduled_instant, started_at, profile) in a ContextVar once the run
wins its claimed->running CAS (or a restart-safe worker adopted the row), and
resets it when the fire ends. ContextVar scoping keeps concurrent jobs and
profiles apart and follows the agent onto the threads the scheduler already
copies context into. Delegated children read None.
Also trims duplicated comments in _run_one_job_body to keep the facade within
its code-health line cap.
Closes#130722
61f8365da7