chore(approval): TODO markers for overlay UX and requestId→sessionId lookup

Two follow-ups for the approval refactor:
- InputReducer STEER input mode hardcodes APPROVE; needs the future
  approve/reject overlay UX to let the user pick.
- GlobalStreamHandler derives scopeSessionId from requestId as a
  placeholder; needs a real requestId → sessionId lookup once exposed.

apps/server/src/main/kotlin/com/correx/apps/server/ws/GlobalStreamHandler.kt

@@ -134,6 +134,9 @@ class GlobalStreamHandler(private val module: ServerModule) {
         msg: ClientMessage.ApprovalResponse,
         sendFrame: suspend (ServerMessage) -> Unit,
     ) {
+        // TODO: scopeSessionId is a placeholder derived from requestId — the global socket
+        // is not bound to a single session. Switch to a proper requestId → sessionId lookup
+        // (via ApprovalCoordinator or the approval repository) once that mapping is exposed.
         val scopeSessionId: SessionId = TypeId(msg.requestId.value)
         module.approvalCoordinator.handleResponse(msg, scopeSessionId)?.let { sendFrame(it) }
     }

apps/tui/src/main/kotlin/com/correx/apps/tui/reducer/InputReducer.kt

@@ -69,6 +69,8 @@ object InputReducer {
                         Effect.SendWs(
                             ClientMessage.ApprovalResponse(
                                 requestId = ApprovalRequestId(active.requestId),
+                                // TODO: hardcoded APPROVE until the approve/reject overlay UX lands;
+                                // then the user picks the decision explicitly alongside the note.
                                 decision = ApprovalDecision.APPROVE,
                                 steeringNote = text,
                             ),