build-cran-binaries/local/tests
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feat(local): aggregate blocked-on-dependency reporting by dependency (#131)
## Why

With cascade detection (#128) live, the latest `auto-apply-patches` run did exactly the right thing — **proposed nothing** (`No auto-proposable candidates`) because every failure is a dependency cascade, and it surfaced the ~30 root-cause dependencies to fix.

But the "Blocked on a dependency" list printed **one line per fingerprint group**, so the same dependency repeated (rstan ×4, lpsymphony ×4, salso ×2, BH ×2, GO.db ×2, RcppCWB ×2, …), burying the priority.

## What

Aggregate blocked packages across all groups **by the dependency they wait on**:

- Expose `blocked_map` (package → dependency) from `build_triage_report()`.
- Add `blocked_by_dependency()` — dedupes dependents (a package in two groups counts once) and ranks dependencies by how many distinct dependents they block.
- Proposer and tracker (log + issue) now print one line per dependency, sorted by impact. Replaces the per-group `blocked_summary`.

## Result (same data, aggregated)

```
Blocked on a dependency (3 dependencies block 6 dependents; fix the dependency, not each dependent):
  RcppParallel             3 dependent(s)
  rstan                    2 dependent(s)
  sf                       1 dependent(s)
```

So the real run becomes a crisp, ranked worklist: RcppParallel (894), sf (128), rstan (~96), Rfast (33), clarabel/DescTools (26), Rglpk (22), xgboost (18), …

## Verified

New test covers cross-group aggregation, dedup (a dependent in two groups counted once), the example cap, and ranking. 112 tests pass; hooks pass.

Reviewed-on: #131
2026-07-16 21:24:03 +00:00
..
test-build-all-args.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
test-failing-builds-classify.R feat(local): detect dependency-cascade failures generally, not just RcppParallel (#128) 2026-07-16 08:23:54 +00:00
test-proposal-tracking-lib.R feat(local): aggregate blocked-on-dependency reporting by dependency (#131) 2026-07-16 21:24:03 +00:00
test-r-minor-helpers.R feat: R-minor-sensitive binary builds (full + iterative) (#84) 2026-06-14 08:04:40 +00:00
test-trim-pkgcache.R fix(ci): bound pkgcache _metadata growth to stop macmini disk-fill (#110) 2026-07-13 09:31:29 +00:00