UOW-012: Add Context Support for Operation Timeouts and Cancellation

[andhijeannot]

Overview

Phase: 4 - Architecture
Priority: Medium
Estimated Effort: 6-8 hours

Problem Description

Current implementation lacks context support for operation control, with no way to cancel long-running operations or handle timeouts.

Acceptance Criteria

• All major operations accept context.Context parameters
• Timeout handling for template processing operations
• Graceful cancellation with proper cleanup
• Resource management with context-aware goroutines
• Signal handling for CLI operations
• Configurable timeouts through configuration system

Files to Modify

• internal/generator/generator.go (add context parameters)
• internal/context/context.go (new file)
• cmd/new.go (add signal handling and timeouts)
• internal/registry/registry.go (add context to operations)

See roadmap/phase4-architecture/UOW-012-context-support.md for detailed implementation plan.