ci: drop x86_64-apple-darwin from release workflow

The Intel Mac job failed the v2.0.5 AND v2.0.6 release workflows because
ort-sys 2.0.0-rc.11 (pinned by fastembed 5.13.2) does not ship Intel Mac
prebuilts. ci.yml already dropped the target weeks ago; release.yml is
now in sync.

README documents the build-from-source path for Intel Mac users and
v2.0.6 also removed the Intel Mac download link from the install block,
so no user-facing promise regresses. When ort-sys ships Intel Mac
prebuilts again, restore the matrix entry.

.github/workflows/release.yml

@@ -31,15 +31,13 @@ jobs:
             os: windows-latest
             archive: zip
             cargo_flags: ""
-          # Intel Mac: drops the old --no-default-features workaround. That
-          # flag was added to sidestep ort-sys lacking Intel Mac prebuilts,
-          # but fixing the feature propagation in vestige-mcp (embeddings
-          # now fully flows through fastembed) means the download-binaries
-          # feature reaches ort-sys the same way it does on aarch64.
-          - target: x86_64-apple-darwin
-            os: macos-14
-            archive: tar.gz
-            cargo_flags: ""
+          # Intel Mac (x86_64-apple-darwin) is explicitly unsupported: the
+          # upstream ort-sys 2.0.0-rc.11 pinned by fastembed 5.13.2 does not
+          # ship Intel Mac prebuilts, and the v2.0.5 + v2.0.6 release
+          # workflows both failed this job. Matches ci.yml which already
+          # dropped the target. README documents the build-from-source path
+          # for Intel Mac users. When ort-sys ships Intel Mac prebuilts
+          # again, restore the entry.
           - target: aarch64-apple-darwin
             os: macos-latest
             archive: tar.gz