Merge remote-tracking branch 'origin/main' into bb/tui-long-session-perf

# Conflicts:
#	ui-tui/src/app/interfaces.ts

ui-tui/src/app/createGatewayEventHandler.ts

@@ -429,12 +429,6 @@ export function createGatewayEventHandler(ctx: GatewayEventHandlerContext): (ev:
 
         return
 
-      case 'btw.complete':
-        dropBgTask('btw:x')
-        sys(`[btw] ${ev.payload.text}`)
-
-        return
-
       case 'subagent.spawn_requested':
         // Child built but not yet running (waiting on ThreadPoolExecutor slot).
         // Preserve completed state if a later event races in before this one.

ui-tui/src/app/interfaces.ts

@@ -33,7 +33,7 @@ export type StatusBarMode = 'bottom' | 'off' | 'top'
 export interface SelectionApi {
   captureScrolledRows: (firstRow: number, lastRow: number, side: 'above' | 'below') => void
   clearSelection: () => void
-  copySelection: () => string
+  copySelection: () => Promise<string>
   getState: () => unknown
   shiftAnchor: (dRow: number, minRow: number, maxRow: number) => void
   shiftSelection: (dRow: number, minRow: number, maxRow: number) => void

ui-tui/src/app/slash/commands/core.ts

@@ -251,11 +251,17 @@ export const coreCommands: SlashCommand[] = [
   {
     help: 'copy selection or assistant message',
     name: 'copy',
-    run: (arg, ctx) => {
+    run: async (arg, ctx) => {
       const { sys } = ctx.transcript
 
-      if (!arg && ctx.composer.hasSelection && ctx.composer.selection.copySelection()) {
-        return sys('copied selection')
+      if (!arg && ctx.composer.hasSelection) {
+        const text = await ctx.composer.selection.copySelection()
+
+        if (text) {
+          return sys(`copied ${text.length} characters`)
+        } else {
+          return sys('clipboard copy failed — try HERMES_TUI_FORCE_OSC52=1 to force the escape sequence; HERMES_TUI_DEBUG_CLIPBOARD=1 for details')
+        }
       }
 
       if (arg && Number.isNaN(parseInt(arg, 10))) {

ui-tui/src/app/slash/commands/session.ts

@@ -1,7 +1,6 @@
 import { attachedImageNotice, introMsg, toTranscriptMessages } from '../../../domain/messages.js'
 import type {
   BackgroundStartResponse,
-  BtwStartResponse,
   ConfigGetValueResponse,
   ConfigSetResponse,
   ImageAttachResponse,
@@ -26,7 +25,7 @@ const persistedModelArg = (arg: string) => {
 
 export const sessionCommands: SlashCommand[] = [
   {
-    aliases: ['bg'],
+    aliases: ['bg', 'btw'],
     help: 'launch a background prompt',
     name: 'background',
     run: (arg, ctx) => {
@@ -47,23 +46,6 @@ export const sessionCommands: SlashCommand[] = [
     }
   },
 
-  {
-    help: 'by-the-way follow-up',
-    name: 'btw',
-    run: (arg, ctx) => {
-      if (!arg) {
-        return ctx.transcript.sys('/btw <question>')
-      }
-
-      ctx.gateway.rpc<BtwStartResponse>('prompt.btw', { session_id: ctx.sid, text: arg }).then(
-        ctx.guarded(() => {
-          patchUiState(state => ({ ...state, bgTasks: new Set(state.bgTasks).add('btw:x') }))
-          ctx.transcript.sys('btw running…')
-        })
-      )
-    }
-  },
-
   {
     help: 'change or show model',
     aliases: ['provider'],