feat: add talk mode across nodes

apps/android/app/src/test/java/com/steipete/clawdis/node/voice/TalkDirectiveParserTest.kt

@@ -0,0 +1,55 @@
+package com.steipete.clawdis.node.voice
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class TalkDirectiveParserTest {
+  @Test
+  fun parsesDirectiveAndStripsHeader() {
+    val input = """
+      {"voice":"voice-123","once":true}
+      Hello from talk mode.
+    """.trimIndent()
+    val result = TalkDirectiveParser.parse(input)
+    assertEquals("voice-123", result.directive?.voiceId)
+    assertEquals(true, result.directive?.once)
+    assertEquals("Hello from talk mode.", result.stripped.trim())
+  }
+
+  @Test
+  fun ignoresUnknownKeysButReportsThem() {
+    val input = """
+      {"voice":"abc","foo":1,"bar":"baz"}
+      Hi there.
+    """.trimIndent()
+    val result = TalkDirectiveParser.parse(input)
+    assertEquals("abc", result.directive?.voiceId)
+    assertTrue(result.unknownKeys.containsAll(listOf("bar", "foo")))
+  }
+
+  @Test
+  fun parsesAlternateKeys() {
+    val input = """
+      {"model_id":"eleven_v3","similarity_boost":0.4,"no_speaker_boost":true,"rate":200}
+      Speak.
+    """.trimIndent()
+    val result = TalkDirectiveParser.parse(input)
+    assertEquals("eleven_v3", result.directive?.modelId)
+    assertEquals(0.4, result.directive?.similarity)
+    assertEquals(false, result.directive?.speakerBoost)
+    assertEquals(200, result.directive?.rateWpm)
+  }
+
+  @Test
+  fun returnsNullWhenNoDirectivePresent() {
+    val input = """
+      {}
+      Hello.
+    """.trimIndent()
+    val result = TalkDirectiveParser.parse(input)
+    assertNull(result.directive)
+    assertEquals(input, result.stripped)
+  }
+}