chore: vendor swabble and add speech usage strings

Swabble/Tests/swabbleTests/ConfigTests.swift

@@ -0,0 +1,23 @@
+import Foundation
+import Testing
+@testable import Swabble
+
+@Test
+func configRoundTrip() throws {
+    var cfg = SwabbleConfig()
+    cfg.wake.word = "robot"
+    let url = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString + ".json")
+    defer { try? FileManager.default.removeItem(at: url) }
+
+    try ConfigLoader.save(cfg, at: url)
+    let loaded = try ConfigLoader.load(at: url)
+    #expect(loaded.wake.word == "robot")
+    #expect(loaded.hook.prefix.contains("Voice swabble"))
+}
+
+@Test
+func configMissingThrows() {
+    #expect(throws: ConfigError.missingConfig) {
+        _ = try ConfigLoader.load(at: FileManager.default.temporaryDirectory.appendingPathComponent("nope.json"))
+    }
+}