feat(discord): interactive AskUserQuestion with buttons and select menus

channel/discord/channel.go

@@ -14,6 +14,7 @@ import (
 	"github.com/gorilla/websocket"
 	"github.com/monsterxx03/tachi/config"
 	"github.com/monsterxx03/tachi/pkg/channel"
+	"github.com/monsterxx03/tachi/pkg/container"
 	"github.com/monsterxx03/tachi/pkg/httpx"
 	"github.com/monsterxx03/tachi/pkg/logger"
 	"gopkg.in/yaml.v3"
@@ -108,6 +109,13 @@ type DiscordChannel struct {
 	// Component callback registry (Phase 2+)
 	componentHandlers map[string]componentHandler
 
+	// Pending AskUserQuestion prompts, keyed by their CustomID token.
+	// Implemented as a LockedMap: PresentQuestions runs on the agent-turn
+	// goroutine, component interactions arrive on discordgo goroutines, and
+	// text-fallback acks come from the manager — all need synchronized
+	// access, and claim/cleanup rely on atomic LoadAndDelete.
+	questionStates *container.LockedMap[string, *questionState]
+
 	// Slash command handler (injected by Manager via CommandChannel interface)
 	cmdHandler channel.CommandHandler
 
@@ -168,6 +176,7 @@ func NewChannel(cfg DiscordConfig) (*DiscordChannel, error) {
 		httpClient:            httpClient,
 		cacheDir:              cacheDir,
 		componentHandlers:     make(map[string]componentHandler),
+		questionStates:        &container.LockedMap[string, *questionState]{},
 		memberCache:           newMemberCache(),
 		deduper:               newMessageDeduper(),
 		topicStatus:           make(map[string]topicEntry),
@@ -217,7 +226,10 @@ Platform characteristics:
 - Media attachments (images, files) are supported as separate uploads
 - Threads are fully supported: the bot can receive and reply inside
   Discord threads without @mention by default (configurable via
-  thread_require_mention)`
+  thread_require_mention)
+- AskUserQuestion renders as interactive buttons / select menus — use it
+  to ask the user multiple-choice questions and get answers through UI
+  clicks (questions without options fall back to a text reply)`
 }
 
 // Send implements channel.MessageSender for proactive message delivery
@@ -484,6 +496,8 @@ func (ch *DiscordChannel) onInteractionCreate(handler channel.MessageHandler) an
 			ch.handleSlashCommand(s, i)
 		case discordgo.InteractionApplicationCommandAutocomplete:
 			ch.handleAutocomplete(s, i)
+		case discordgo.InteractionMessageComponent:
+			ch.handleComponentInteraction(s, i, handler)
 		}
 	}
 }