fix(localrepo): Exact local package match, no .old on medium, rebuild on bump

- tests: match localrepo packages by exact name (foo no longer satisfied
  by foo-bar-*.pkg.tar.zst).
- update.sh: copy the db/files by name so repo-add's *.old backups stay
  off the medium.
- build-end4-deps.sh: rebuild a local PKGBUILD when it is newer than the
  built package (a quickshell _commit bump used to be skipped).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/tests.yaml

@@ -268,10 +268,18 @@ jobs:
             done
 
             # 2) Check localrepo/ for a pre-built .pkg.tar.zst
-            if [[ $MATCHED -eq 0 ]] && compgen -G "localrepo/${pkg}-*.pkg.tar.zst" > /dev/null 2>&1; then
-              MATCHED=1
-              FOUND=$((FOUND + 1))
-              echo "📦 LOCAL: $pkg (pre-built in localrepo/)"
+            #    Exact name: strip -<pkgver>-<pkgrel>-<arch>.pkg.tar.zst, so
+            #    "foo" is not satisfied by foo-bar-1.0-1-any.pkg.tar.zst
+            if [[ $MATCHED -eq 0 ]]; then
+              for f in localrepo/"${pkg}"-*.pkg.tar.zst; do
+                b=${f##*/}
+                if [[ "${b%-*-*-*}" == "$pkg" ]]; then
+                  MATCHED=1
+                  FOUND=$((FOUND + 1))
+                  echo "📦 LOCAL: $pkg (pre-built in localrepo/)"
+                  break
+                fi
+              done
             fi
 
             # 3) Check build-end4-deps.sh for the package name