Add interactive client terminal transport

docs/schema.md

@@ -650,6 +650,45 @@ classDiagram
         Exit
     }
 
+    class InteractiveSessionRequest {
+        <<serialized>>
+        protocol_version
+        session_id
+        argv
+        initial_size
+    }
+
+    class InteractiveSessionEvent {
+        <<serialized>>
+        <<union>>
+        Terminal
+        PromptDecision
+        Poll
+    }
+
+    class TerminalPrompt {
+        <<serialized>>
+        session_id
+        request_id
+        request_sha256
+        agent_profile
+        command_argv
+        justification
+    }
+
+    class InteractiveSessionMessage {
+        <<serialized>>
+        <<union>>
+        Terminal
+        Prompt
+    }
+
+    class InteractiveSessionBatch {
+        <<serialized>>
+        session_id
+        messages
+    }
+
     SessionTerminalEvent --> TerminalInput
     SessionTerminalEvent --> TerminalResize
     SessionTerminalEvent --> TerminalSignal
@@ -660,6 +699,11 @@ classDiagram
     SessionExit --> SessionExitOutcome
     NonInteractiveSessionMessage --> NonInteractiveOutput : Stdout / Stderr
     NonInteractiveSessionMessage --> SessionExit : Exit
+    InteractiveSessionRequest --> TerminalResize : initial_size
+    InteractiveSessionEvent --> SessionTerminalEvent : Terminal
+    InteractiveSessionMessage --> SessionTerminalMessage : Terminal
+    InteractiveSessionMessage --> TerminalPrompt : Prompt
+    InteractiveSessionBatch --> InteractiveSessionMessage
 ```
 
 `exit_code` is present only for `Exited` and is the status collected from the
@@ -739,6 +783,7 @@ classDiagram
         Enroll
         Register
         Execute
+        ExecuteInteractive
     }
 
     class ControlResponse {