Add Homebrew formula and update build script

Add Formula/perspective.rb for the Perspective CLI (macOS ARM64): metadata, dependency on macOS/arm64, install of the perspective binary and optional mlx.metallib, and a basic help test. Update build.sh to patch the formula's release URL and sha256 during distribution and print copy instructions for the homebrew tap.

Author: mikedoise

Formula/perspective.rb

@@ -0,0 +1,19 @@
+class Perspective < Formula
+  desc "Swift CLI for Apple Foundation Models and MLX models"
+  homepage "https://github.com/techopolis/PerspectiveCLI"
+  url "https://github.com/techopolis/PerspectiveCLI/releases/download/0.13.0/perspective-cli-0.13.0-macos-arm64.tar.gz"
+  sha256 "67e3237d1449a035bd880a47f6c90e3d51e9af37bb6f8a2958df66dcc1bacd3c"
+  license "MIT"
+
+  depends_on arch: :arm64
+  depends_on :macos
+
+  def install
+    bin.install "perspective"
+    lib.install "mlx.metallib" if File.exist?("mlx.metallib")
+  end
+
+  test do
+    assert_match "perspective", shell_output("#{bin}/perspective --help 2>&1", 1)
+  end
+end

build.sh

@@ -130,6 +130,21 @@ if $DIST; then
     echo ""
     echo "Or one-liner (after publishing the release):"
     echo "  curl -fsSL https://raw.githubusercontent.com/techopolis/PerspectiveCLI/main/scripts/remote-install.sh | bash"
+
+    # ── Update Homebrew formula ───────────────────────────────────────
+    FORMULA="$PROJECT_DIR/Formula/perspective.rb"
+    if [ -f "$FORMULA" ]; then
+        sed -i '' "s|url \".*\"|url \"https://github.com/techopolis/PerspectiveCLI/releases/download/${VERSION}/perspective-cli-${VERSION}-macos-arm64.tar.gz\"|" "$FORMULA"
+        sed -i '' "s|sha256 \".*\"|sha256 \"${SHA}\"|" "$FORMULA"
+        echo ""
+        echo "Homebrew formula updated:"
+        echo "  $FORMULA"
+        echo "  version: $VERSION"
+        echo "  sha256:  $SHA"
+        echo ""
+        echo "Copy to your homebrew-tap repo:"
+        echo "  cp $FORMULA /path/to/homebrew-tap/Formula/"
+    fi
 fi
 
 echo "Build complete."