refactor: rename project from Predix to NexQuant

Rename all source files, scripts, tests, documentation, and configuration
from Predix/predix to NexQuant/nexquant across the entire codebase.

rdagent/components/coder/rl/__init__.py

@@ -1,4 +1,4 @@
-"""RL Trading Agent components for Predix.
+"""RL Trading Agent components for NexQuant.
 
 This package provides reinforcement learning trading capabilities.
 Works with or without stable-baselines3 (graceful fallback).

rdagent/components/coder/rl/agent.py

@@ -2,7 +2,7 @@
 RL Trading Agent wrapper for Stable Baselines3.
 
 Provides an easy-to-use interface for training, evaluating, and deploying
-RL trading agents within the Predix framework.
+RL trading agents within the NexQuant framework.
 
 Supported algorithms:
 - PPO: Proximal Policy Optimization (most stable, recommended for production)

rdagent/components/coder/rl/env.py

@@ -5,7 +5,7 @@ Gym-compatible environment for training RL trading agents.
 Supports single-asset (EUR/USD) trading with technical indicators
 and portfolio state as observations.
 
-Inspired by common RL trading environment patterns, implemented from scratch for Predix.
+Inspired by common RL trading environment patterns, implemented from scratch for NexQuant.
 """
 
 import gymnasium as gym

rdagent/components/coder/rl/fallback.py

@@ -2,7 +2,7 @@
 Fallback RL implementation for users without stable-baselines3.
 
 Provides simple rule-based trading when RL library is not available.
-This ensures the Predix system works for all GitHub users, even
+This ensures the NexQuant system works for all GitHub users, even
 without the optional stable-baselines3 dependency.
 
 The fallback implements a momentum-based strategy as a placeholder