UOW-009: Add Worker Pools for Concurrent File Processing

[andhijeannot]

Overview

Phase: 3 - Performance
Priority: Medium
Estimated Effort: 8-10 hours

Problem Description

Current implementation processes files sequentially, which is inefficient for large templates with many files and underutilizes CPU cores.

Acceptance Criteria

• Concurrent file processing with configurable worker pools
• Intelligent work distribution based on file size and type
• Dependency-aware processing order
• Progress tracking for concurrent operations
• Performance improvement of >60% for large templates

Files to Modify

• internal/generator/concurrent.go (new file)
• internal/generator/concurrent_test.go (new file)
• internal/generator/generator.go (update to use concurrent processing)

See roadmap/phase3-performance/UOW-009-concurrent-processing.md for detailed implementation plan.