feat(chat): 动作/旁白格式统一——兼容星号(＊…＊/＊…) + 人设强制 XML

模型常漂移成 ＊动作：弯起眼睛＊(星号)，前端/后端只认 <action>/<narration>，导致星号版
没被剥成灰斜体注记/没从 IM 剥除→裸出在气泡、上下文不连贯。
- parseContent.ts(新): 把 XML <action>/<narration>、全角＊…＊(带'动作/旁白/内心/神态/轻声'
  关键词或整段≤40字)、半角*词…*(仅关键词前缀)统一解析成 ContentPart,剥出正文进 BubbleNotes
  灰斜体注记(＊动作:…＊); 超长无关键词＊…＊保留为文本; <p>拆气泡不变
- sanitize.go: stripNarration 同样剥星号动作(与 XML 一致); splitBubbles 不变
- cyrene.yaml: 新增格式铁律——动作/旁白必须用 <action>/<narration>,禁用＊/Markdown等
验收: 后端 build/vet/test 全绿 + 前端 build 绿 + Node parseContent/splitBubble 实测(5组)

internal/services/channelbridge/sanitize.go

@@ -5,6 +5,7 @@ import (
 	"regexp"
 	"strings"
 	"time"
+	"unicode/utf8"
 )
 
 // This file holds the chat-reply sanitizer used before a reply is delivered to an
@@ -24,8 +25,21 @@ var (
 	paragraphRe = regexp.MustCompile(`(?is)</?p\b[^>]*?>`)
 	// blankLinesRe collapses runs of blank lines left behind after stripping.
 	blankLinesRe = regexp.MustCompile(`\n\s*\n+`)
+	// starRoleplayRe matches a full-width star-wrapped block ＊...＊ — the drift
+	// form when the model forgets the <action>/<narration> XML tags. The body is
+	// captured so a non-role-play full-width emphasis can be left alone.
+	starRoleplayRe = regexp.MustCompile(`(?s)＊([\s\S]*?)＊`)
+	// halfStarRoleplayRe matches a half-width star block that clearly carries a
+	// role-play keyword (动作/旁白/内心/神态/轻声), so *动作：弯起眼睛* is stripped
+	// while plain markdown *emphasis* is left untouched.
+	halfStarRoleplayRe = regexp.MustCompile(`(?s)\*((?:动作|旁白|内心|神态|轻声)\s*[:：]?[\s\S]*?)\*`)
 )
 
+// shortRoleplayRunes caps how long a keyword-less full-width star block may be
+// and still be treated as a role-play remark (design §9.5: conservative — a long
+// keyword-less ＊...＊ paragraph is left as text rather than dropped wholesale).
+const shortRoleplayRunes = 40
+
 // stripNarration returns the plain chat text of a reply with role-play/action/
 // narration markup removed, paragraph markers flattened and blank-line runs
 // collapsed. It never raises or panics on malformed input; a reply that was only an
@@ -36,11 +50,43 @@ func stripNarration(text string) string {
 	}
 	s := pairedRoleplayRe.ReplaceAllString(text, "")
 	s = strayRoleplayRe.ReplaceAllString(s, "")
+	s = starRoleplayRe.ReplaceAllStringFunc(s, func(m string) string {
+		if isStarRoleplay(strings.TrimSpace(strings.TrimSuffix(strings.TrimPrefix(m, "＊"), "＊"))) {
+			return ""
+		}
+		return m
+	})
+	s = halfStarRoleplayRe.ReplaceAllString(s, "")
 	s = paragraphRe.ReplaceAllString(s, "")
 	s = blankLinesRe.ReplaceAllString(s, "\n")
 	return strings.TrimSpace(s)
 }
 
+// isStarRoleplay reports whether a full-width star block ＊...＊ holds a role-play
+// remark: it carries a role-play keyword, or it is a short stand-alone fragment
+// (no newline, no long body) — the drift shape ＊弯起眼睛＊. A long keyword-less
+// paragraph wrapped in stars is kept so a real message is not dropped.
+func isStarRoleplay(inner string) bool {
+	t := strings.TrimSpace(inner)
+	if t == "" {
+		return false
+	}
+	if hasRoleplayPrefix(t) {
+		return true
+	}
+	return !strings.Contains(t, "\n") && utf8.RuneCountInString(t) <= shortRoleplayRunes
+}
+
+// hasRoleplayPrefix reports whether the block starts with a role-play keyword.
+func hasRoleplayPrefix(t string) bool {
+	for _, p := range []string{"动作", "旁白", "内心", "神态", "轻声"} {
+		if strings.HasPrefix(t, p) {
+			return true
+		}
+	}
+	return false
+}
+
 // paragraphBlockRe matches an entire <p>...</p> block, capturing its inner text
 // (design: each <p> is one chat bubble; the Web client renders each as its own
 // bubble and the IM adapters deliver each as its own message).