fix(release): drop Windows target, fix sha256sum portability

.github/workflows/release.yml

@@ -13,6 +13,7 @@ jobs:
     name: Build ${{ matrix.suffix }}
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         include:
           - goos: linux
@@ -27,10 +28,6 @@ jobs:
           - goos: darwin
             goarch: arm64
             suffix: darwin-arm64
-          - goos: windows
-            goarch: amd64
-            suffix: windows-amd64
-            ext: .exe
 
     steps:
       - uses: actions/checkout@v4
@@ -50,7 +47,7 @@ jobs:
           go build \
             -trimpath \
             -ldflags="-s -w -X main.version=${{ github.ref_name }}" \
-            -o dist/seshat-${{ matrix.suffix }}${{ matrix.ext || '' }} \
+            -o dist/seshat-${{ matrix.suffix }} \
             ./cmd/cli
 
       - name: Build gRPC server
@@ -62,7 +59,7 @@ jobs:
           go build \
             -trimpath \
             -ldflags="-s -w -X main.version=${{ github.ref_name }}" \
-            -o dist/seshat-grpc-${{ matrix.suffix }}${{ matrix.ext || '' }} \
+            -o dist/seshat-grpc-${{ matrix.suffix }} \
             ./cmd/grpc
 
       - name: Upload artifacts
@@ -89,6 +86,5 @@ jobs:
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v2
         with:
-          files: |
-            dist/**
+          files: dist/**
           generate_release_notes: true

scripts/install.sh

@@ -17,6 +17,17 @@
 
 set -euo pipefail
 
+# Portable SHA256 check: sha256sum (Linux) or shasum -a 256 (macOS)
+_sha256check() {
+    if command -v sha256sum &>/dev/null; then
+        sha256sum --check --status
+    elif command -v shasum &>/dev/null; then
+        shasum -a 256 --check --status
+    else
+        error "No SHA256 tool found (sha256sum or shasum)" ; exit 1
+    fi
+}
+
 REPO="EngineerProjects/seshat"
 BINARY="seshat"
 INSTALL_DIR="${INSTALL_DIR:-$HOME/.local/bin}"
@@ -104,7 +115,7 @@ _dl "$BASE_URL/SHA256SUMS.txt"   "$TMP_DIR/SHA256SUMS.txt"
 # ── Verify checksum ───────────────────────────────────────────────────────────
 step "Verifying checksum"
 
-(cd "$TMP_DIR" && grep "$BIN_ASSET" SHA256SUMS.txt | sha256sum --check --status) \
+(cd "$TMP_DIR" && grep "$BIN_ASSET" SHA256SUMS.txt | _sha256check) \
     || { error "Checksum verification failed — aborting."; exit 1; }
 success "Checksum OK"