feat(local): aggregate blocked-on-dependency reporting by dependency #131
2026-07-16
feat(local): aggregate blocked-on-dependency reporting by dependency
With cascade detection live, a run surfaced ~30 root-cause dependencies, but the "blocked on a dependency" list repeated the same dependency once per fingerprint group (rstan x4, lpsymphony x4, salso x2, ...), burying the priority. Aggregate across all groups by the dependency each dependent waits on: expose `blocked_map` (package -> dependency) from build_triage_report, and add `blocked_by_dependency()` which dedupes dependents and ranks dependencies by how many they block. One line per dependency, sorted by impact, in the proposer and tracker (log + issue). Replaces the per-group `blocked_summary`.