feat(robot): gender-agree Cyrillic handle adjectives

Cyrillic adjective+noun handles paired a masculine adjective with any noun, so a
feminine noun read ungrammatically ("Вольный Комета"). Carry masculine + feminine
adjective forms (cyrAdjective) and tag each noun's gender (cyrNoun); cyrillicNick
now renders the adjective in the agreeing form ("Рыжая Комета", "Дикий Волк"), and a
few feminine nouns (Комета/Звезда/Молния/Пантера/Рысь/Буря/Сова/Акула) are added for variety.

backend/internal/robot/namevariety.go

@@ -122,23 +122,28 @@ func chineseName() string {
 	return family + given
 }
 
-// latinNick builds a Latin handle from the adjective and noun stem pools.
+// latinNick builds a Latin handle from the adjective and noun stem pools. English
+// adjectives do not inflect, so any pairing reads naturally.
 func latinNick() string {
-	return composeNick(adjLatin, nounLatin)
+	return assembleHandle(adjLatin[rand.IntN(len(adjLatin))], nounLatin[rand.IntN(len(nounLatin))])
 }
 
-// cyrillicNick builds a Cyrillic handle from the adjective and noun stem pools.
+// cyrillicNick builds a Cyrillic handle, agreeing the adjective's form with the noun's
+// grammatical gender ("Дикий Волк", "Дикая Рысь").
 func cyrillicNick() string {
-	return composeNick(adjCyr, nounCyr)
+	noun := nounCyr[rand.IntN(len(nounCyr))]
+	adj := adjCyr[rand.IntN(len(adjCyr))]
+	form := adj.m
+	if noun.female {
+		form = adj.f
+	}
+	return assembleHandle(form, noun.word)
 }
 
-// composeNick assembles a handle from an adjective and noun pool: a bare noun, an
+// assembleHandle joins an adjective and noun into a handle: a bare noun, the two joined
-// adjective and noun joined by "_" or "." or camel-cased, optionally followed by a
+// by "_" or "." or camel-cased, optionally followed by a trailing number. It keeps at
-// trailing number. It keeps at most one separator so the result, the number aside,
+// most one separator so the result, the number aside, reads like a name a human could pick.
-// reads like a name a human could pick.
+func assembleHandle(adj, noun string) string {
-func composeNick(adjectives, nouns []string) string {
-	adj := adjectives[rand.IntN(len(adjectives))]
-	noun := nouns[rand.IntN(len(nouns))]
 	var base string
 	switch rand.IntN(4) {
 	case 0:
@@ -242,17 +247,37 @@ var nounLatin = []string{
 	"Phantom", "Comet", "Nova", "Blade", "Arrow", "Storm", "Wizard", "Ninja",
 }
 
-// adjCyr and nounCyr are the adjective and noun stems for Cyrillic handles.
+// cyrAdjective is a Russian adjective in its masculine and feminine forms, so a handle's
-var adjCyr = []string{
+// stem can agree with the gender of its noun.
-	"Тёмный", "Ночной", "Снежный", "Лунный", "Звёздный", "Огненный", "Ледяной", "Стальной", "Дикий", "Тихий",
+type cyrAdjective struct{ m, f string }
-	"Быстрый", "Гордый", "Грозный", "Хитрый", "Смелый", "Весёлый", "Рыжий", "Серый", "Золотой", "Дерзкий",
+
-	"Лютый", "Бравый", "Мудрый", "Шальной", "Вольный", "Яростный", "Седой", "Жгучий",
+// cyrNoun is a Russian noun for a handle, tagged feminine so the paired adjective agrees.
+type cyrNoun struct {
+	word   string
+	female bool
 }
 
-var nounCyr = []string{
+// adjCyr and nounCyr are the adjective and noun stems for Cyrillic handles; cyrillicNick
-	"Волк", "Лис", "Ворон", "Тигр", "Орёл", "Дракон", "Сокол", "Ястреб", "Лев", "Медведь",
+// renders the adjective in the form that agrees with the chosen noun's gender.
-	"Барс", "Кот", "Кит", "Странник", "Охотник", "Рыцарь", "Маг", "Призрак", "Воин", "Комета",
+var adjCyr = []cyrAdjective{
-	"Клинок", "Ветер", "Гром", "Шторм", "Пилот", "Капитан", "Мастер", "Енот",
+	{"Тёмный", "Тёмная"}, {"Ночной", "Ночная"}, {"Снежный", "Снежная"}, {"Лунный", "Лунная"},
+	{"Звёздный", "Звёздная"}, {"Огненный", "Огненная"}, {"Ледяной", "Ледяная"}, {"Стальной", "Стальная"},
+	{"Дикий", "Дикая"}, {"Тихий", "Тихая"}, {"Быстрый", "Быстрая"}, {"Гордый", "Гордая"},
+	{"Грозный", "Грозная"}, {"Хитрый", "Хитрая"}, {"Смелый", "Смелая"}, {"Весёлый", "Весёлая"},
+	{"Рыжий", "Рыжая"}, {"Серый", "Серая"}, {"Золотой", "Золотая"}, {"Дерзкий", "Дерзкая"},
+	{"Лютый", "Лютая"}, {"Бравый", "Бравая"}, {"Мудрый", "Мудрая"}, {"Шальной", "Шальная"},
+	{"Вольный", "Вольная"}, {"Яростный", "Яростная"}, {"Седой", "Седая"}, {"Жгучий", "Жгучая"},
+}
+
+var nounCyr = []cyrNoun{
+	{"Волк", false}, {"Лис", false}, {"Ворон", false}, {"Тигр", false}, {"Орёл", false},
+	{"Дракон", false}, {"Сокол", false}, {"Ястреб", false}, {"Лев", false}, {"Медведь", false},
+	{"Барс", false}, {"Кот", false}, {"Кит", false}, {"Странник", false}, {"Охотник", false},
+	{"Рыцарь", false}, {"Маг", false}, {"Призрак", false}, {"Воин", false}, {"Клинок", false},
+	{"Ветер", false}, {"Гром", false}, {"Шторм", false}, {"Пилот", false}, {"Капитан", false},
+	{"Мастер", false}, {"Енот", false},
+	{"Комета", true}, {"Звезда", true}, {"Молния", true}, {"Пантера", true}, {"Рысь", true},
+	{"Буря", true}, {"Сова", true}, {"Акула", true},
 }
 
 // firstNamesRUWide is a broad pool of Russian first names — full and colloquial forms