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/factgate_test.go

@@ -2,6 +2,9 @@ package main
 
 import (
 	"context"
+	"net/http"
+	"net/url"
+	"strings"
 	"testing"
 	"time"
 
@@ -33,6 +36,10 @@ func newFactGateHandler(t *testing.T, now time.Time) (*reactiveHandler, ipc.Core
 func TestActionFact_QuestionIsNotWritten(t *testing.T) {
 	ctx := context.Background()
 	h, api := newFactGateHandler(t, time.Now())
+	searchH, seen := searchHandler(t,
+		`{"answers":["Актуальная версия Go — 1.25."],"results":[]}`,
+		http.StatusOK)
+	h.search = searchH.search
 
 	reply := h.actionFact(ctx, router.Decision{
 		Intent:    router.IntentFact,
@@ -50,11 +57,14 @@ func TestActionFact_QuestionIsNotWritten(t *testing.T) {
 	if len(hits) != 0 {
 		t.Fatalf("the question was indexed for recall: %+v", hits)
 	}
-	// It went down the query chain instead. Nothing is configured to answer a
-	// world question in this harness, so "не знаю." is the honest outcome —
-	// what matters is that the turn was answered, not stored.
-	if reply == "" {
-		t.Fatal("the turn was neither stored nor answered")
+	// It went down the world query chain instead. This asserts the actual
+	// destination, not merely that the write was refused: the regression was
+	// the personal boundary claiming this question before search.
+	if !strings.Contains(reply, "1.25") {
+		t.Fatalf("reply = %q, want live world evidence", reply)
+	}
+	if !strings.Contains(*seen, "q="+url.QueryEscape("какая последняя версия языка Go?")) {
+		t.Fatalf("search query = %q; world source was not reached verbatim", *seen)
 	}
 }