Cancel a reminder by voice, and honour a refusal (V-719)

reminder_cancel.go is a stateful pre-route resolver ahead of a parked
clarification and the statistical cascade. It accepts only an addressed
command-position imperative plus the reminder or alarm noun, so questions,
reported speech, past-tense reports and prohibitions establish no mutation
authority. Subject terms keep negation and quantity, and a parsed time
passes the same resolved-hour gate as capture.

One match cancels through the typed IPC method. Several are stored as
session candidates in the spoken order, capped at five, and only a whole
affirmative ordinal consumes that list: re-querying on the follow-up would
let a state change move the ordinal underneath him. No match, an unread
time, a spent ordinal and an ambiguous delivery result are all explicit
no-ops.

command_prohibition.go is the first mutation boundary in a turn. A direct
prohibition clears the three confirmation slots under their shared mutex,
so a later bare "да" cannot revive authority he has just revoked. A parked
clarify question is not authority and survives, suspended and repeated.
refusesCommand is the same belt at the executor entry points, checked
against the original utterance so a model rewriting Slots.Text cannot get
around it.

The rung is named in preRouteLadder, so /trace records whether it won or
declined on every surface.

--no-verify: master is the working branch this session by the owner's call.

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

cmd/mavend/self_test.go

@@ -65,6 +65,36 @@ func TestSelfSourceAnswersFromTheDescription(t *testing.T) {
 	}
 }
 
+// V-720: asking how to operate Maven is never a third-party web-search query.
+func TestMavenHowToAnswersLocallyWithoutSearch(t *testing.T) {
+	for _, testCase := range []struct {
+		utterance string
+		want      string
+	}{
+		{"как отменить напоминание про молоко?", "отмени напоминание"},
+		{"как отменить задачу настроить бэкапы?", "убери из задач"},
+		{"можно ли отменить напоминание?", "отмени напоминание"},
+		{"can I cancel a reminder?", "отмени напоминание"},
+		{"could I cancel a task?", "убери из задач"},
+	} {
+		h, seen := searchHandler(t,
+			`{"answers":["Инструкция стороннего приложения"],"results":[]}`,
+			200)
+		reply := h.actionQuery(context.Background(), router.Decision{
+			Intent:         router.IntentQuery,
+			Utterance:      testCase.utterance,
+			Source:         router.SourceSelf,
+			SourceAnchored: true,
+		})
+		if !strings.Contains(reply, testCase.want) {
+			t.Errorf("%q reply = %q, want local usage example containing %q", testCase.utterance, reply, testCase.want)
+		}
+		if *seen != "" {
+			t.Errorf("%q leaked to search as %q", testCase.utterance, *seen)
+		}
+	}
+}
+
 // TestSelfDescriptionHoldsThePersona — it is her own text and she reads it out,
 // so the same rules the phrasing eval enforces apply to it. Feminine
 // self-reference, informal address, no pet names.