Convert rover features as golang executable

## Description

Convert the rover from a Docker container-based solution to a Golang executable. This will improve performance, reduce resource overhead, and provide a more lightweight deployment option for the Terraform platform engineering toolset.

## Current State

The rover is currently implemented as a Docker container with:
- 88% Shell scripts
- 8.3% Dockerfile
- 2% Python
- 1.5% HCL
- 0.2% Makefile

## Benefits of Migration to Go

- **Performance**: Faster execution and lower memory footprint
- **Portability**: Single binary distribution across platforms
- **Reduced dependencies**: No Docker runtime requirement
- **Simplified deployment**: Direct executable without container orchestration
- **Better resource utilization**: Lower overhead compared to containerized solution
- **Cross-platform support**: Native binaries for different OS/architectures

## Migration Tasks

- [ ] Analyze current shell script functionality and map to Go modules
- [ ] Design Go application architecture and CLI interface
- [ ] Implement core Terraform deployment logic in Go
- [ ] Port configuration management features
- [ ] Implement Azure-specific platform engineering features
- [ ] Add comprehensive testing suite
- [ ] Create build pipeline for multi-platform binaries
- [ ] Update documentation and usage examples
- [ ] Provide migration guide for existing users
- [ ] Maintain backward compatibility during transition

## Technical Considerations

- **CLI Framework**: Consider using cobra/viper for command-line interface
- **Configuration**: Migrate existing configuration formats
- **Azure SDK**: Leverage Azure SDK for Go
- **Terraform Integration**: Use Terraform Go SDK or exec approach
- **Logging**: Implement structured logging
- **Error Handling**: Robust error handling and user feedback

## Acceptance Criteria

- [ ] Go executable provides equivalent functionality to current Docker solution
- [ ] Performance benchmarks show improvement over container version
- [ ] Cross-platform binaries available (Linux, macOS, Windows)
- [ ] Comprehensive test coverage
- [ ] Updated documentation
- [ ] Migration path documented for existing users

## Additional Context

This migration represents a significant architectural change that will modernize the rover toolset and align with current Go ecosystem practices for infrastructure tooling.

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**Review Note (2026-01-12)**: Current branch shows migration to Rust (001-shell-to-rust-migration) rather than Go. This issue should be updated to reflect the actual migration strategy or closed if Rust is the chosen path.

Start by reviewing the current branch named 001-shell-to-rust-migration and comparing it with the existing Docker and shell-based rover. Resolve whether Go or Rust is the intended target before defining the architecture, implementation scope, tests, binaries, documentation, and migration path; the issue is not done until that strategy and equivalent functionality are established.

Written by the indexing model from the issue text.