feat(scheduler): ✨ Control scheduled executions with flow

[haskou]

Summary

• Add the updated local agent skills under .agents/skills.
• Add @haskou/flow@0.1.2 as a runtime dependency.
• Wrap scheduler runOnce() execution in Flow with a shared Semaphore(1) so overlapping cron ticks serialize instead of running concurrently.
• Add scheduler coverage for overlapping executions.

Impact

• Keeps existing cron scheduling and SchedulerErrorPolicy behavior.
• Prevents concurrent executions of the same scheduler instance.
• Does not replace RetryConsumerMiddleware; its current shouldRetry, onRetry, and dynamic delay semantics are more specific than Flow.retry().

Validation

• yarn lint
• yarn typecheck
• yarn test (151 tests passing)

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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