Each idea row now has a Generate button that triggers single-article
generation via a background WP-Cron job. Skips the pipeline's collect/
analyze/score steps and goes straight to Article_Worker with the
selected idea. Button shows real-time stage updates via per-idea status
transients, then swaps to Edit/View links with cost on completion.
Respects the generation lock to prevent concurrent runs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>