confirm answers match whole words from the lexicon (V-567)

classifyConfirm was a substring test over bare stems, so "погода",
"дальше", "надо" and "давление" all read as "да", and "покажи" and
"около" read as "ок". resolveConfirm runs before routing, so a question
about the weather executed a parked destructive act. Reproduced on the box:
with "restart nonexistent-xyz" parked, "какая погода" answered "не
получилось выполнить команду".

The yes and no answers are now two closed sets in internal/lexicon, matched
as whole tokens longest-first, and the WHOLE utterance must be answer words
and filler — a leading "давай" does not make "давай посмотрим погоду" an
answer. Anything else is confirmUnknown, which now leaves the confirm parked
instead of disarming it: an utterance that is not an answer is not a
cancellation either.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

internal/lexicon/lexicon.go

@@ -65,6 +65,7 @@ func mustLoad() lexiconFile {
 		"day_offsets", "weekdays", "months_genitive", "hours_spoken",
 		"not_place_after_v", "parts_of_day", "reminder_verbs", "half_hour",
 		"filler_particles", "task_done_words", "task_drop_words",
+		"confirm_yes", "confirm_no",
 	} {
 		s, ok := f.Sets[name]
 		if !ok || (len(s.Words) == 0 && len(s.Values) == 0) {
@@ -121,6 +122,16 @@ func ReminderVerbs() []string { return words("reminder_verbs") }
 // notes say: an imperative exactly, a stative by lemma.
 func TaskDoneWords() []string { return words("task_done_words") }
 
+// ConfirmYes returns the words that answer a parked confirm with yes, and
+// ConfirmNo the ones that answer it with no. Some members are multi-word ("не
+// надо"), so a caller matches longest-first over tokens rather than looking up
+// one word at a time. See the sets' notes for why neither may be matched as a
+// substring.
+func ConfirmYes() []string { return words("confirm_yes") }
+
+// ConfirmNo — see ConfirmYes.
+func ConfirmNo() []string { return words("confirm_no") }
+
 // TaskDropWords — see TaskDoneWords.
 func TaskDropWords() []string { return words("task_drop_words") }