Run failed or AI key errors

Each pipeline stage has humanized error handling, so a failure shows a friendly reason, fetch, scoring, or proposal, instead of a stack trace.

• Key invalid / quota: re-validate your AI key under Settings → Providers.
• Fetch failed: usually a transient Freelancer API hiccup; the next run retries.
• Scoring/proposal failed: check your selected model is still available on your provider.