fix(release): drop unsupported targets (x86_64-darwin, windows)

ort-sys has no prebuilt ONNX binary for Intel Mac, so x86_64-apple-darwin builds fail. flowctl-daemon uses Unix sockets, so Windows builds fail. Drop both targets from the release matrix.

Also drop fastembed's image-models feature since we only use TextEmbedding for memory semantic search (saves ~20 transitive deps).

ensure-flowctl.sh now degrades gracefully: Intel Mac falls back to cargo build, Windows prints WSL recommendation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: z23cc

.github/workflows/release.yml

@@ -27,12 +27,10 @@ jobs:
             os: ubuntu-latest
           - target: aarch64-unknown-linux-gnu
             os: ubuntu-latest
-          - target: x86_64-apple-darwin
-            os: macos-latest
           - target: aarch64-apple-darwin
             os: macos-latest
-          - target: x86_64-pc-windows-msvc
-            os: windows-latest
+          # Note: Windows is unsupported — flowctl-daemon uses Unix sockets.
+          # Windows users should run flowctl via WSL.
 
     steps:
       - uses: actions/checkout@v4