v0.55.2 — Fix /stop race condition + misleading 'No active task' message

Two bugs in the OnCommand /stop handler:

1. Race condition: both /stop's OnCommand handler and handleChatMessage's
   cancellation handler called LoadAndDelete on chatRunInfos. The loser
   saw an empty map and reported 'No active task to stop' even though the
   cancel function was found and called.

2. Missing fallback: when the cancel func was found but chatRunInfos was
   empty (race or first-iteration timing), the handler fell through to
   'No active task' instead of reporting cancellation.

Fix: use Load (read-only) instead of LoadAndDelete for chatRunInfos,
leaving cleanup to handleChatMessage's defer. Track whether the cancel
func was actually called, and report '⏹️ Task cancelled.' when run info
is unavailable but cancellation was successful.

Author: molty3000

cmd/odek/telegram.go

@@ -384,15 +384,24 @@ func telegramCmd(args []string) error {
 		// Handle /stop — cancel the running agent task and report a summary.
 		if cmdName == "stop" {
 			// Cancel the running agent context, if any.
+			cancelled := false
 			if cancelVal, ok := chatCancels.LoadAndDelete(chatID); ok {
 				cancel := cancelVal.(context.CancelFunc)
 				cancel()
+				cancelled = true
 			}
 			// Retrieve the latest run info for a summary of what was interrupted.
+			// Use Load, not LoadAndDelete — handleChatMessage's cancellation handler
+			// and defer own the cleanup. Racing with LoadAndDelete here would strip
+			// the info before the cancellation handler can format its own message.
 			var summary string
-			if infoVal, ok := chatRunInfos.LoadAndDelete(chatID); ok {
+			if infoVal, ok := chatRunInfos.Load(chatID); ok {
 				info := infoVal.(loop.IterationInfo)
 				summary = formatStopSummary(info)
+			} else if cancelled {
+				// Cancel was sent but no run info yet (first iteration callback
+				// hadn't fired). Report cancellation without detailed summary.
+				summary = "⏹️ *Task cancelled.*"
 			} else {
 				summary = "⏹️ No active task to stop."
 			}