normalize-policy phase-4: remove extra trim/lower from language/trigger/context handling

pkg/agent/context.go

@@ -174,8 +174,8 @@ func (cb *ContextBuilder) shouldLoadBootstrap() bool {
 	if idErr != nil || userErr != nil {
 		return true
 	}
-	idText := strings.TrimSpace(string(identityData))
-	userText := strings.TrimSpace(string(userData))
+	idText := string(identityData)
+	userText := string(userData)
 	if idText == "" || userText == "" {
 		return true
 	}

pkg/agent/language.go

@@ -18,7 +18,6 @@ func DetectResponseLanguage(userText, preferred, last string) string {
 }
 
 func detectFromText(text string) string {
-	text = strings.TrimSpace(text)
 	if text == "" {
 		return ""
 	}
@@ -54,7 +53,7 @@ func detectFromText(text string) string {
 }
 
 func normalizeLang(lang string) string {
-	lang = strings.TrimSpace(strings.ToLower(lang))
+	lang = strings.ToLower(lang)
 	switch lang {
 	case "zh", "zh-cn", "zh_hans", "chinese":
 		return "zh-CN"
@@ -74,7 +73,7 @@ func normalizeLang(lang string) string {
 
 // ExtractLanguagePreference detects explicit user instructions for language switch.
 func ExtractLanguagePreference(text string) string {
-	s := strings.ToLower(strings.TrimSpace(text))
+	s := text
 	if s == "" {
 		return ""
 	}
@@ -85,22 +84,22 @@ func ExtractLanguagePreference(text string) string {
 	koHints := []string{"한국어", "reply in korean", "speak korean"}
 
 	for _, h := range enHints {
-		if strings.Contains(s, strings.ToLower(h)) {
+		if strings.Contains(s, h) {
 			return "en"
 		}
 	}
 	for _, h := range zhHints {
-		if strings.Contains(s, strings.ToLower(h)) {
+		if strings.Contains(s, h) {
 			return "zh-CN"
 		}
 	}
 	for _, h := range jaHints {
-		if strings.Contains(s, strings.ToLower(h)) {
+		if strings.Contains(s, h) {
 			return "ja"
 		}
 	}
 	for _, h := range koHints {
-		if strings.Contains(s, strings.ToLower(h)) {
+		if strings.Contains(s, h) {
 			return "ko"
 		}
 	}

pkg/agent/trigger_audit.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"os"
 	"path/filepath"
-	"strings"
 	"sync"
 	"time"
 )
@@ -79,7 +78,7 @@ func (ta *triggerAudit) Record(trigger, channel, session string, suppressed bool
 }
 
 func normalizeTrigger(v string) string {
-	s := strings.ToLower(strings.TrimSpace(v))
+	s := v
 	if s == "" {
 		return "user"
 	}