chore: pin bincraft 4.2.0 and drop superseded standalone r-minor workflow

Bumps the bincraft git-tag pin and version guard from v4.1.1 to v4.2.0 across
all .crow workflows, removes .crow/build-r-minor-sensitive-packages.yaml (now
superseded by the integrated full + iterative flow), and drops its now-orphaned
hook-exclude entries.

.pre-commit-config.yaml

@@ -1,12 +1,11 @@
 # cSpell:ignore autofix autoupdate
-# Excluded: verbatim GPL license, auxiliary shell scripts with intentional
-# in-string formatting, and the soon-to-be-removed standalone workflow.
+# Excluded: verbatim GPL license and auxiliary shell scripts with intentional
+# in-string formatting (reformatting would corrupt their output).
 exclude: |
   (?x)^(
     LICENSE\.md|
     benchmark/|
-    docker/reprex/|
-    \.crow/build-r-minor-sensitive-packages\.yaml
+    docker/reprex/
   )
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks