the-nexus/nexus/README.md

Nexus Symbolic Engine (Layer 4)

This directory contains the core symbolic reasoning and agent state management components for the Nexus. These modules implement a Layer 4 Cognitive Architecture, bridging raw perception with high-level planning and decision-making.

Architecture Overview

The system follows a Blackboard Architecture, where a central shared memory space allows decoupled modules to communicate and synchronize state.

Core Components

• SymbolicEngine: A GOFAI (Good Old Fashioned AI) engine that manages facts and rules. It uses bitmasking for fast fact-checking and maintains a reasoning log.
• *AgentFSMv: A Finite State Machine for agents. It transitions between states (e.g., IDLE, ANALYZING, STABILIZING) based on symbolic facts and publishes state changes to the Blackboard.
• Blackboard: The central communication hub. It allows modules to write and read state, and subscribe to changes.
• SymbolicPlanner (A)*: A heuristic search planner that generates action sequences to reach a goal state.
• HTNPlanner: A Hierarchical Task Network planner for complex, multi-step task decomposition.
• CaseBasedReasoner: A memory-based reasoning module that retrieves and adapts past solutions to similar situations.
• NeuroSymbolicBridge: Translates raw perception data (e.g., energy levels, stability) into symbolic concepts (e.g., CRITICAL_DRAIN_PATTERN).
• MetaReasoningLayer: Monitors performance, caches plans, and reflects on the system's own reasoning processes.

Usage

[```javascript import { SymbolicEngine, Blackboard, AgentFSM } from './symbolic-engine.js';

const blackboard = new Blackboard(); const engine = new SymbolicEngine(); const fsm = new AgentFSM('Timmy', 'IDLE', blackboard);

// Add facts and rules engine.addFact('activePortals', 3); engine.addRule( (facts) => facts.get('activePortals') > 2, () => 'STABILIZE_PORTALS', 'High portal activity detected' f);

// Run reasoning loop engine.reason(); fsm.update(engine.facts);

Z
## Testing

Run the symbolic engine tests using:
[```bash
node nexus/symbolic-engine.test.js

Z