say, persona, ttsnorm: the clock is spoken and the months have one copy (V-581)

A clock time read aloud now inflects its nouns and drops its leading zeros.
The old rewrite said "часов" for every hour and "минут" for every minute, so
21:00 came out as "21 часов" and 14:00 as "14 часов 00 минут". Russian
inflects a noun after a numeral and internal/say already owns that rule, so
spokenTime calls say.CountWord for both halves and omits the minutes when
there are none. 21:00 is "21 час", 22:02 is "22 часа 2 минуты", 14:00 is
"14 часов".

internal/persona held its own copies of the twelve months and the seven
weekdays. Both are closed classes and both already live in internal/lexicon,
which is where cmd/mavend/ruwords.go sent its copy. The block now reads
lexicon.Weekday and lexicon.MonthGenitive and carries no word list of its own.

LoadSummaries asserted that stall_sitting keeps its two counts and not the two
count words beside them. A variant dropping {word} or {dayword} would have
loaded and spoken a bare number. Both are required now.

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

internal/persona/persona.go

@@ -17,6 +17,8 @@ import (
 	"fmt"
 	"strings"
 	"time"
+
+	"github.com/kami/maven/internal/lexicon"
 )
 
 // Facts — the optional, deployment-specific half of the block. All fields may
@@ -34,12 +36,10 @@ type Facts struct {
 	Tools    bool // at least one shell act is on the allowlist
 }
 
-var ruWeekdays = [...]string{"воскресенье", "понедельник", "вторник", "среда", "четверг", "пятница", "суббота"}
-
-var ruMonths = [...]string{
-	"января", "февраля", "марта", "апреля", "мая", "июня",
-	"июля", "августа", "сентября", "октября", "ноября", "декабря",
-}
+// The weekday and month names are closed classes and live in internal/lexicon,
+// which indexes weekdays from Sunday the way time.Weekday does and months from
+// one. This file used to carry its own copies, making four copies of the twelve
+// months in the tree after cmd/mavend/ruwords.go gave up its own (Vikunja #525).
 
 // Block renders the context block for one turn. Russian even in front of the
 // English prompts: the rules it states are Russian grammar (ты/тебя, feminine
@@ -61,7 +61,7 @@ func (f Facts) Block(now time.Time) string {
 	}
 
 	b.WriteString(fmt.Sprintf("Сейчас: %s, %d %s %d, %02d:%02d (местное время).\n",
-		ruWeekdays[int(now.Weekday())], now.Day(), ruMonths[int(now.Month())-1], now.Year(),
+		lexicon.Weekday(int(now.Weekday())), now.Day(), lexicon.MonthGenitive(int(now.Month())), now.Year(),
 		now.Hour(), now.Minute()))
 
 	b.WriteString("Умеешь: " + strings.Join(f.can(), "; ") +