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feat(abi): repair from the recorded verdicts rather than an ad-hoc scan (#206)
## Why

The reprex found 44 routed-path failures: `Rcpp`, `Matrix` and `RJSONIO` served to R 4.4 from 4.5 builds. Two causes, both now fixed (#205 here, #129 in bincraft) — but the repair itself also needs redoing, and the lists it ran from no longer exist.

Those lists came from a one-off local symbol scan, seeded from a candidate set derived on a single slot. That made them a lower bound by construction: the scan found 846 package-slot pairs, while inspecting every object found **4077** unsafe.

`abi_flat_safety` now holds the authoritative answer for every slot, written by the flat-safety backfill from the binaries themselves:

```
95418 inspected, 91325 safe, 4077 unsafe (4.3%)
```

against the 93% of compiled packages the source classifier suspects.

## What it does

- `local/list-unsafe-flat-objects.R` prints the objects recorded as unable to load under some minor, for one slot.
- The workflow rebuilds each under **every** R minor installed in the image, with **no `--sensitive-only` gate**. Since bincraft v5.3.0 the destination is decided by the built binary's symbols, so a package needing a per-minor slot lands there and a portable one lands in the flat slot. Gating on the source classifier is exactly what let `Rcpp` slip through.

## Safety

It **fails loudly when a slot has no verdicts at all**, rather than printing an empty list. An empty repair list is indistinguishable from "nothing to repair" and would read as success while doing nothing — the same shape of silent failure as the missing `PGPASS`.

`crow lint` passes.

## After this

Run it fleet-wide, re-index, then re-run the reprex. The routed paths are the ones that must come back clean; the `flat` form's failures are the separate prune question.

Reviewed-on: #206
2026-09-07 18:46:50 +00:00
..
archive-missed-packages.yaml fix(index): add a slot repair for a broken Built stamp and retire alpine 3.21 (#150) 2026-08-07 09:15:04 +00:00
auto-apply-patches.yaml fix(ci): install RPostgres for audit workflows (#172) 2026-08-30 07:31:28 +00:00
backfill-abi-classification.yaml feat(abi): backfill classifier verdicts for pre-per-minor packages (#199) 2026-09-04 10:34:49 +00:00
backfill-flat-safety.yaml fix(ci): authenticate uvr's GitHub resolution in the index workflows (#204) 2026-09-05 15:59:16 +00:00
build-all-versions-install-deps.yaml fix(ci): make every manual gate default to a value that matches nothing (#158) 2026-08-09 15:31:14 +00:00
build-all-versions.yaml fix(ci): install RPostgres in build shards (#195) 2026-09-03 20:09:20 +00:00
process-updates.yaml fix(ci): install RPostgres for metadata updates 2026-08-28 08:48:58 +00:00
prune-stale-flat-binaries.yaml fix(abi): prune flat-slot binaries of ABI-risky packages (#200) 2026-09-04 10:54:09 +00:00
rebuild-abi-gap.yaml fix(ci): do not gate the targeted repair on the source classifier (#205) 2026-09-07 06:20:04 +00:00
reindex.yaml fix(ci): authenticate uvr's GitHub resolution in the index workflows (#204) 2026-09-05 15:59:16 +00:00
repair-built-stamp.yaml fix(ci): make every manual gate default to a value that matches nothing (#158) 2026-08-09 15:31:14 +00:00
repair-unsafe-flat-objects.yaml feat(abi): repair from the recorded verdicts rather than an ad-hoc scan (#206) 2026-09-07 18:46:50 +00:00
trial-build-registry.yaml fix(ci): gate the three ungated pipelines on their own variable (#155) 2026-08-09 10:02:05 +00:00
weekly-audit-missing.yaml fix(ci): install RPostgres for audit workflows (#172) 2026-08-30 07:31:28 +00:00
weekly-patch-proposals.yaml fix(ci): install RPostgres for audit workflows (#172) 2026-08-30 07:31:28 +00:00
weekly-rebuild-missing.yaml Revert "fix(ci): split oversized weekly rebuild matrix" 2026-08-14 07:01:56 +00:00
weekly-rebuild-reindex.yaml fix(ci): authenticate uvr's GitHub resolution in the index workflows (#204) 2026-09-05 15:59:16 +00:00