make events external dylibs

Package.swift

@@ -8,18 +8,28 @@ let package = Package(
 	platforms: [
 		.macOS(.v15)
 	],
+	products: [
+		// The public SDK external event recognizers depend on. Ships the
+		// `PHEventRecognizer` protocol + factory-symbol contract, nothing else.
+		.library(name: "phbarEvents", targets: ["phbarEvents"]),
+	],
 	dependencies: [
 		.package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.2.0"),
 		.package(url: "https://github.com/mattt/swift-toml.git", from: "2.0.0"),
 	],
 	targets: [
-		// Targets are the basic building blocks of a package, defining a module or a test suite.
-		// Targets can depend on other targets in this package and products from dependencies.
+		// The public event-recognizer SDK. External libraries depend on this
+		// product; the host target depends on it to bridge recognizers in.
+		.target(
+			name: "phbarEvents",
+			path: "Sources/phbarEvents"
+		),
 		.executableTarget(
 			name: "phbar",
 			dependencies: [
 				.product(name: "ArgumentParser", package: "swift-argument-parser"),
 				.product(name: "TOML", package: "swift-toml"),
+				.target(name: "phbarEvents"),
 			],
 			resources: [
 				.process("config.toml"),
@@ -32,7 +42,7 @@ let package = Package(
 		),
 		.testTarget(
 			name: "phbarTests",
-			dependencies: ["phbar"]
+			dependencies: ["phbar", "phbarEvents"]
 		),
 	],
 	swiftLanguageModes: [.v6]