Fix cron local-model preflight fallback handling so scheduled runs try configured fallback candidates before skipping when the local primary is unavailable.
Verification:
- GitHub CI on PR head fe884dab90: passing required CI checks.
- Local focused cron/model fallback tests passed earlier for the touched surface.
- Local merge-wrapper build and check passed on the prepared candidate.
- Local full pnpm test reported unrelated failures outside this PR's touched files; touched files are limited to cron docs, src/agents/model-fallback.ts, and src/cron/isolated-agent/*.
Co-authored-by: chen-zhang-cs-code <chenzhangcode@163.com>
Co-authored-by: Onur Solmaz <2453968+osolmaz@users.noreply.github.com>
7a381b807e