Update module name to github.com/fraktal/mev-beta and fix channel closing issues in pipeline stages

@prompts/OPENCODE.md

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+# MEV Bot Project - OpenCode Context
+
+This file contains context information for OpenCode about the MEV Bot project.
+
+## Project Overview
+This is an MEV (Maximal Extractable Value) bot written in Go 1.24+ that monitors the Arbitrum sequencer for potential swap opportunities. When a potential swap is detected, the bot scans the market to determine if the swap is large enough to move the price using off-chain methods.
+
+## Key Integration Points
+- Refer to @prompts/COMMON.md for core requirements and integration points
+- Follow the modular architecture with independent components
+- Use the universal message bus for inter-module communication
+- Adhere to the standards defined in the project plan
+
+## Development Guidelines
+- Focus on implementing the features outlined in the project plan
+- Ensure all code follows Go best practices
+- Write comprehensive tests for all functionality
+- Document all public APIs and complex algorithms
+- Follow the performance requirements outlined in COMMON.md