feat(memory): 长记忆 store（SQLite+persona 隔离）/工作记忆滑动窗口/检索注入/手工提取钩子

internal/runtime/memory/message.go

@@ -0,0 +1,24 @@
+package memory
+
+import (
+	"strings"
+
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
+)
+
+// messageText returns the concatenated plain-text payload of a message. Image
+// parts are skipped; text parts are joined with a single space. It is the
+// shared text view used by the working-memory summary and the manual extractor.
+func messageText(m model.Message) string {
+	var b strings.Builder
+	for _, part := range m.Content {
+		if part.Type != model.ContentTypeText {
+			continue
+		}
+		if b.Len() > 0 {
+			b.WriteByte(' ')
+		}
+		b.WriteString(part.Text)
+	}
+	return b.String()
+}