Initial release

Tests/KnotchyCoreTests/CLIRunnerTests.swift

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+import Foundation
+import Testing
+@testable import KnotchyCore
+
+struct CLIRunnerTests {
+    @Test func findsARuntimeInstalledAfterLaunch() throws {
+        let directory = FileManager.default.temporaryDirectory.appendingPathComponent("cli-\(UUID().uuidString)")
+        try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true)
+        defer { try? FileManager.default.removeItem(at: directory) }
+        let tool = directory.appendingPathComponent("container")
+        let runner = CLIRunner(searchPaths: [tool.path])
+        #expect(runner.executable == nil)
+
+        try "#!/bin/sh\necho container CLI version 1.4.1\n".write(to: tool, atomically: true, encoding: .utf8)
+        try FileManager.default.setAttributes([.posixPermissions: 0o755], ofItemAtPath: tool.path)
+        #expect(runner.executable == tool.path)
+        #expect(try runner.runBlocking(["--version"], timeout: 5).text.contains("1.4.1"))
+    }
+}