Scaffold mafiabot_core module stubs

Add assumption-free skeletons for the modules documented in the README:
empty Engine/Economy/Sockets/Exploits packages, null-body Mafiabot and
Engine_Tests procedures, and a placeholder config/config.yaml.

mafiabot_core/src/core/engine.adb

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+package body Engine is
+end Engine;

mafiabot_core/src/core/engine.ads

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+pragma Elaborate_Body;
+package Engine is
+end Engine;

mafiabot_core/src/daemons/economy.adb

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+package body Economy is
+end Economy;

mafiabot_core/src/daemons/economy.ads

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+pragma Elaborate_Body;
+package Economy is
+end Economy;

mafiabot_core/src/mafiabot.adb

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+procedure Mafiabot is
+begin
+   null;
+end Mafiabot;

mafiabot_core/src/network/sockets.adb

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+package body Sockets is
+end Sockets;

mafiabot_core/src/network/sockets.ads

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+pragma Elaborate_Body;
+package Sockets is
+end Sockets;

mafiabot_core/src/payloads/exploits.adb

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+package body Exploits is
+end Exploits;

mafiabot_core/src/payloads/exploits.ads

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+pragma Elaborate_Body;
+package Exploits is
+end Exploits;