Add a kapture CLI so agents can capture windows and screens

kapture capture --app <name> (or --window-id / --screen) writes a PNG and
prints its path; kapture list enumerates on-screen windows. The CLI is a
thin client: requests go to the running menu-bar app over distributed
notifications plus JSON files in Application Support, so captures use the
app's Screen Recording grant and its window/display logic — no second
permission. The app launches automatically when needed, and the bundled
CLI opens its own app bundle rather than a stale installed copy.

Built as `kapture-cli` (Kapture/kapture collide on the case-insensitive
filesystem), signed nested in the app bundle, and installed on PATH as
`kapture` by the Homebrew cask's binary stanza.

Generated with OpenCode

Assisted-by: Kimi:k3

Package.swift

@@ -4,10 +4,22 @@ import PackageDescription
 let package = Package(
     name: "Kapture",
     platforms: [.macOS(.v13)],
+    products: [
+        .executable(name: "Kapture", targets: ["Kapture"]),
+        // Command-line client for agents and scripts; talks to the running
+        // menu-bar app over distributed notifications (no extra permissions).
+        // Named kapture-cli because "Kapture" and "kapture" collide on the
+        // case-insensitive filesystem; the cask installs it as `kapture`.
+        .executable(name: "kapture-cli", targets: ["KaptureCLI"]),
+    ],
     targets: [
         .executableTarget(
             name: "Kapture",
             path: "Sources/Kapture"
-        )
+        ),
+        .executableTarget(
+            name: "KaptureCLI",
+            path: "Sources/KaptureCLI"
+        ),
     ]
 )