Cron handlers (daily generation, metrics collection), AJAX handlers
(generate now, test connection), atomic generation lock, and model
registry access moved to PRAutoBlogger_Executor. Main orchestrator
retains hook registration, DB migrations, and cron schedule filter.
Backward-compatible proxy methods on PRAutoBlogger.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
