The blocking rule now leads with the tracker's native dependency
relationship and encodes the rationale: native rendering makes the
frontier visible in the tracker's own UI, so the human sees what's
takeable without opening the map. Notes the body-convention fallback
for trackers that lack native blocking (GitHub has it; GitLab only on
paid tiers).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
