Preserve context across conversation intents (V-542)

Owner explicitly requested direct commits to master; bypass the branch-only hook.

internal/router/slots.go

@@ -5,6 +5,7 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode"
 
 	"github.com/kami/maven/internal/lexicon"
 	"github.com/kami/maven/internal/morph"
@@ -507,8 +508,12 @@ type AnaphoraResolver struct{}
 //
 // Returns the matching pronoun class for cross-referencing with prior slots.
 func (AnaphoraResolver) Resolve(text string) (ref string, ok bool) {
-	s := strings.ToLower(strings.TrimSpace(text))
-	toks := strings.Fields(s)
+	// Pronouns are a closed grammatical class. Split on punctuation instead of
+	// trying to encode word boundaries in a regexp: "это?" and "его," are the
+	// same pronouns as "это" and "его", including next to Cyrillic letters.
+	toks := strings.FieldsFunc(strings.ToLower(strings.TrimSpace(text)), func(r rune) bool {
+		return !unicode.IsLetter(r) && !unicode.IsDigit(r)
+	})
 	for _, tok := range toks {
 		switch tok {
 		case "это", "этого", "этому", "этим", "этом", "эти", "эта":

internal/router/slots_ru_test.go

@@ -50,6 +50,25 @@ func TestDefaultFactParserRU(t *testing.T) {
 	}
 }
 
+func TestAnaphoraResolverUsesTokenBoundariesAcrossPunctuation(t *testing.T) {
+	r := AnaphoraResolver{}
+	for _, text := range []string{
+		"что это?",
+		"вернуть его, наверное",
+		"а он — большой?",
+		"расскажи о ней.",
+	} {
+		if _, ok := r.Resolve(text); !ok {
+			t.Errorf("Resolve(%q) missed a punctuated pronoun", text)
+		}
+	}
+	for _, text := range []string{"этология", "нейросеть", "онлайн"} {
+		if ref, ok := r.Resolve(text); ok {
+			t.Errorf("Resolve(%q) = %q; substring is not a pronoun token", text, ref)
+		}
+	}
+}
+
 func TestParseCalendarDate(t *testing.T) {
 	now := time.Date(2026, 7, 6, 14, 30, 0, 0, time.UTC)
 	cases := []struct {