R7.7: one source archive pair per release

Windows checks out symlinks as files, so only Linux (CI) and macOS
(release.sh) write source archives. ci.sh skips names already on
the release; the first platform's copy stays.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/scripts/ci-share.sh

@@ -23,7 +23,8 @@ attempt() { # name, setup; sets status, writes the output
   cp "$root/packaging/apps.tsv" "$clone/packaging/"
   (cd "$clone" && eval "$2")
   status=0
-  ELY_SHARE=$share ELY_RELEASE_TOKEN=unused "$clone/scripts/ci.sh" macos "v$version" >"$work/$1.out" 2>&1 ||
+  ELY_SHARE=$share ELY_RELEASE_TOKEN=unused ELY_SIGN_IDENTITY=unused ELY_NOTARY_PROFILE=unused \
+    "$clone/scripts/ci.sh" macos "v$version" >"$work/$1.out" 2>&1 ||
     status=$?
 }
 # The target as stored plus a newline and x.