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Implement initializeScheduler() and stopScheduler() functions for the scraper cron job module. Key features: - Config-driven enable/disable via SCRAPER_ENABLED environment variable - Cron expression validation with fallback to default schedule (0 6 * * *) - Minimum interval enforcement (1-hour floor) to prevent excessive runs - Timezone support via SCRAPER_TIMEZONE configuration - Mutex lock integration to prevent concurrent scraper executions - Automatic lock release in finally block for error resilience - getScheduleExpression() and getNextScheduledRun() status helpers Add comprehensive test suite with 42 tests covering mutex locking, scheduler lifecycle, cron validation, minimum interval enforcement, concurrent execution prevention, and error handling.