feat(settings): KEEL_AW_URL with localhost default

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/settings/settings.go

@@ -17,11 +17,12 @@ import (
 var ErrInvalidBackend = errors.New("settings: invalid ai backend")
 
 // Settings is the user-editable configuration. Field names mirror the env vars
-// they replace: KEEL_AI_BACKEND, KEEL_MARVIN_CMD, KEEL_KNOWLEDGE_FILE.
+// they replace: KEEL_AI_BACKEND, KEEL_MARVIN_CMD, KEEL_KNOWLEDGE_FILE, KEEL_AW_URL.
 type Settings struct {
 	AIBackend     string `json:"ai_backend"`
 	MarvinCmd     string `json:"marvin_cmd"`
 	KnowledgePath string `json:"knowledge_path"`
+	AWURL         string `json:"aw_url"`
 }
 
 // DefaultPath returns ~/.keel/settings.json.
@@ -72,9 +73,14 @@ func SeedFromEnv() Settings {
 	if backend == "" {
 		backend = "claude"
 	}
+	awURL := os.Getenv("KEEL_AW_URL")
+	if awURL == "" {
+		awURL = "http://localhost:5600"
+	}
 	return Settings{
 		AIBackend:     backend,
 		MarvinCmd:     os.Getenv("KEEL_MARVIN_CMD"),
 		KnowledgePath: os.Getenv("KEEL_KNOWLEDGE_FILE"),
+		AWURL:         awURL,
 	}
 }