Implement steps 1 + 2 of issue #115: turn recorded build failures into
triaged patch suggestions instead of hand-scraping Crow logs.
- add local/failing-builds-classify.R with pure, DB-free helpers to
normalise error_text into a stable fingerprint and classify it against a
seed signature set (removed tbb_stddef.h, RcppParallel bundled TBB,
system libuv link leak), each carrying a fix tier, confidence, and an
auto/human-only flag
- add local/failing-builds-report.R, a read-only entrypoint that queries
single_builds WHERE error_occurred, groups by root cause, classifies
each group, and prints (optionally emits JSON) a triaged report with a
pre-filled registry.json entry for known, safe fix levers only
- keep novel source diffs and unknown signatures routed to human triage,
per the issue guardrails; never write to the DB or the registry
- cover the helpers with local/tests/test-failing-builds-classify.R and
document the workflow in local/patches/README.md
## Summary
Builds R-minor-sensitive CRAN packages once per installed R minor version (into per-minor S3 slots `…/contrib/<x.y>/`) and everything else once into the generic slot, driven by bincraft 4.2.0's ABI classifier. Both the full and iterative pipelines are covered.
## What's in here
**Detection / precompute**
- `local/r-minor-helpers.R` — pure `classify_from_metadata()` (NeedsCompilation / risky `LinkingTo`) + `parse_build_args()`, with unit tests.
- `local/packages-to-build.R` — adds a per-package `r_minor_sensitive` flag: cheap CRAN-metadata rules first, source download + `bincraft::needs_per_minor_recompile()` only for the ambiguous compiled subset (fail-safe to sensitive). Classified once per package, applied to all versions.
**Full build**
- `local/build-all.R` — passes the per-row `is_r_minor_sensitive` flag; new `--sensitive-only` mode builds just the risky subset.
- `.crow/build-all-versions-{amd64,arm64}.yaml` — install-deps persists the sensitive subset; build step runs a sensitive-only pass under each non-primary `/opt/R/*` minor; new step uploads the generic index plus a per-minor index for each minor.
**Iterative build**
- All 14 `.crow/process-updates-*.yaml` — primary pass uses `r_minor_detection = 'classifier'`; a sensitive-only multi-R pass builds risky updates under each other minor; per-minor index upload added.
**Tooling / housekeeping**
- Pins bincraft `v4.1.1` → `v4.2.0` across all workflows; removes the superseded standalone `build-r-minor-sensitive-packages.yaml`.
- Adds prek/pre-commit hooks (prettier, markdownlint, editorconfig-checker, yamllint, air) and applies them repo-wide; excludes the verbatim GPL `LICENSE.md` and auxiliary shell scripts.
- Design + implementation docs under `docs/superpowers/`.
## Requires before merge
- A `v4.2.0` git tag must be pushed on the bincraft repo (codefloe.com/rpkgs/bincraft) — the workflow install steps pin `@v4.2.0`. The full-build install-deps clones `main`, so it is unaffected.
Reviewed-on: #84
