Adopt PromptKit profile inheritance

internal/promptassets/assets/profiles/weather-balanced.yml

@@ -1,6 +1,2 @@
 id: weather-balanced
-backend: openrouter
-model: "~google/gemini-flash-latest"
-reasoning_effort: high
-timeout_seconds: 240
-service_tier: flex
+base_profile: gemini-flash-latest

internal/promptassets/assets/profiles/weather-deep.yml

@@ -1,6 +1,2 @@
 id: weather-deep
-backend: openrouter
-model: "~anthropic/claude-sonnet-latest"
-reasoning_effort: high
-timeout_seconds: 240
-service_tier: flex
+base_profile: claude-sonnet-latest

internal/promptassets/assets/profiles/weather-light.yml

@@ -1,5 +1,2 @@
 id: weather-light
-backend: openrouter
-model: deepseek/deepseek-v4-flash
-timeout_seconds: 180
-service_tier: flex
+base_profile: deepseek-4-flash

internal/promptassets/promptassets_test.go

@@ -361,6 +361,29 @@ func TestEmbeddedProfilesAreCompleteAndInspectable(t *testing.T) {
 	}
 }
 
+func TestEmbeddedProfilesAreMinimalBaseAliases(t *testing.T) {
+	wantBases := map[string]string{
+		"weather-balanced.yml": "gemini-flash-latest",
+		"weather-deep.yml":     "claude-sonnet-latest",
+		"weather-light.yml":    "deepseek-4-flash",
+	}
+	for path, wantBase := range wantBases {
+		t.Run(path, func(t *testing.T) {
+			data, err := fs.ReadFile(promptassets.ProfileFS(), path)
+			if err != nil {
+				t.Fatalf("read profile: %v", err)
+			}
+			var definition map[string]string
+			if err := yaml.Unmarshal(data, &definition); err != nil {
+				t.Fatalf("unmarshal profile: %v", err)
+			}
+			if definition["id"] != strings.TrimSuffix(path, ".yml") || definition["base_profile"] != wantBase || len(definition) != 2 {
+				t.Fatalf("profile definition = %#v, want only its id and base profile %q", definition, wantBase)
+			}
+		})
+	}
+}
+
 func TestEmbeddedProfilesExcludeUnsafeOrIncidentalSettings(t *testing.T) {
 	forbidden := []string{"endpoint:", "api_key", "credential", "temperature:", "top_p:", "max_tokens:"}
 	if err := fs.WalkDir(promptassets.ProfileFS(), ".", func(path string, entry fs.DirEntry, err error) error {