(workflow) add simple harness workflow for manual testing

internal/config/config.go

@@ -1,3 +1,41 @@
 package config
 
-// Empty stub - will be filled in T0.8
+import (
+	"os"
+)
+
+// TemporalConfig holds Temporal cluster configuration.
+type TemporalConfig struct {
+	HostPort  string // default: 127.0.0.1:7233
+	Namespace string // default: production
+	TLSCert   string // env: TEMPORAL_TLS_CERT (file path)
+	TLSKey    string // env: TEMPORAL_TLS_KEY (file path)
+}
+
+// AppConfig holds application configuration.
+type AppConfig struct {
+	Temporal         TemporalConfig
+	AnthropicAPIKey  string
+}
+
+// LoadConfig loads application configuration from environment variables.
+func LoadConfig() (AppConfig, error) {
+	cfg := AppConfig{
+		Temporal: TemporalConfig{
+			HostPort:  getEnvOrDefault("TEMPORAL_HOSTPORT", "127.0.0.1:7233"),
+			Namespace: getEnvOrDefault("TEMPORAL_NAMESPACE", "production"),
+			TLSCert:   os.Getenv("TEMPORAL_TLS_CERT"),
+			TLSKey:    os.Getenv("TEMPORAL_TLS_KEY"),
+		},
+		AnthropicAPIKey: os.Getenv("ANTHROPIC_API_KEY"),
+	}
+
+	return cfg, nil
+}
+
+func getEnvOrDefault(key, defaultVal string) string {
+	if val := os.Getenv(key); val != "" {
+		return val
+	}
+	return defaultVal
+}