feat: add compliance logging for successful user logins

Adds structured compliance log entry in CompleteSession when users
successfully authenticate, including user ID, session ID, timestamp,
and user details for audit purposes.

Author: rhnvrm

kc/manager.go

@@ -403,6 +403,16 @@ func (m *Manager) CompleteSession(mcpSessionID, kiteRequestToken string) error {
 	m.Logger.Info("Setting Kite access token for MCP session", "session_id", mcpSessionID)
 	kiteData.Kite.Client.SetAccessToken(userSess.AccessToken)
 
+	// Compliance log for successful login
+	m.Logger.Info("COMPLIANCE: User login completed successfully",
+		"event", "user_login_success",
+		"user_id", userSess.UserID,
+		"session_id", mcpSessionID,
+		"timestamp", time.Now().UTC().Format(time.RFC3339),
+		"user_name", userSess.UserName,
+		"user_type", userSess.UserType,
+	)
+
 	// Track successful login
 	if m.metrics != nil {
 		m.metrics.TrackDailyUser(userSess.UserID)