增加不同上下文模式

internal/config/codec.go

@@ -51,7 +51,7 @@ func (c Config) MarshalJSON() ([]byte, error) {
 	if c.CurrentInputFile.Enabled != nil || c.CurrentInputFile.MinChars != 0 {
 		m["current_input_file"] = c.CurrentInputFile
 	}
-	if c.ThinkingInjection.Enabled != nil {
+	if c.ThinkingInjection.Enabled != nil || strings.TrimSpace(c.ThinkingInjection.Prompt) != "" {
 		m["thinking_injection"] = c.ThinkingInjection
 	}
 	if c.VercelSyncHash != "" {
@@ -177,6 +177,7 @@ func (c Config) Clone() Config {
 		},
 		ThinkingInjection: ThinkingInjectionConfig{
 			Enabled: cloneBoolPtr(c.ThinkingInjection.Enabled),
+			Prompt:  c.ThinkingInjection.Prompt,
 		},
 		VercelSyncHash:   c.VercelSyncHash,
 		VercelSyncTime:   c.VercelSyncTime,

internal/config/config.go

@@ -184,5 +184,6 @@ type CurrentInputFileConfig struct {
 }
 
 type ThinkingInjectionConfig struct {
-	Enabled *bool `json:"enabled,omitempty"`
+	Enabled *bool  `json:"enabled,omitempty"`
+	Prompt  string `json:"prompt,omitempty"`
 }

internal/config/store_accessors.go

@@ -208,3 +208,9 @@ func (s *Store) ThinkingInjectionEnabled() bool {
 	}
 	return *s.cfg.ThinkingInjection.Enabled
 }
+
+func (s *Store) ThinkingInjectionPrompt() string {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return strings.TrimSpace(s.cfg.ThinkingInjection.Prompt)
+}

internal/config/store_accessors_test.go

@@ -83,4 +83,9 @@ func TestStoreThinkingInjectionAccessors(t *testing.T) {
 	if store.ThinkingInjectionEnabled() {
 		t.Fatal("expected thinking injection disabled by explicit config")
 	}
+
+	store.cfg.ThinkingInjection.Prompt = "  custom thinking prompt  "
+	if got := store.ThinkingInjectionPrompt(); got != "custom thinking prompt" {
+		t.Fatalf("thinking injection prompt=%q want custom thinking prompt", got)
+	}
 }