docs: Add ROADMAP.md

- Completed items (v0.2.0): IaC package, CDK, Pulumi, CloudFormation
- In progress: Terraform modules
- Planned: ECS/Fargate, Helm charts, streaming, multi-cloud
- Module overview table
- Versioning timeline

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: grokify

ROADMAP.md

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+# Roadmap
+
+This document outlines the development roadmap for agentkit and its companion modules.
+
+## Completed (v0.2.0)
+
+- [x] IaC configuration package (`platforms/agentcore/iac/`)
+- [x] AWS CDK constructs ([agentkit-aws-cdk](https://github.com/agentplexus/agentkit-aws-cdk))
+- [x] Pulumi components ([agentkit-aws-pulumi](https://github.com/agentplexus/agentkit-aws-pulumi))
+- [x] Pure CloudFormation generation
+- [x] AWS deployment guide documentation
+
+## In Progress
+
+- [ ] Terraform modules ([agentkit-terraform](https://github.com/agentplexus/agentkit-terraform))
+
+## Planned
+
+### Deployment Targets
+
+- [ ] ECS/Fargate support
+- [ ] Extended Helm chart library for Kubernetes
+
+### Runtime Features
+
+- [ ] Streaming response support
+- [ ] Additional LLM provider adapters
+- [ ] Enhanced observability integrations
+
+### Multi-Cloud
+
+- [ ] GCP Pulumi components (agentkit-gcp-pulumi)
+- [ ] Azure Pulumi components (agentkit-azure-pulumi)
+- [ ] GCP Terraform modules
+- [ ] Azure Terraform modules
+
+## Module Overview
+
+| Module | Status | Purpose |
+|--------|--------|---------|
+| [agentkit](https://github.com/agentplexus/agentkit) | GA | Core library, shared IaC config, CloudFormation |
+| [agentkit-aws-cdk](https://github.com/agentplexus/agentkit-aws-cdk) | GA | AWS CDK constructs |
+| [agentkit-aws-pulumi](https://github.com/agentplexus/agentkit-aws-pulumi) | GA | AWS Pulumi components |
+| [agentkit-terraform](https://github.com/agentplexus/agentkit-terraform) | Planned | Terraform modules (AWS/GCP/Azure) |
+
+## Contributing
+
+Contributions are welcome! If you're interested in working on any roadmap item:
+
+1. Check existing issues for related discussions
+2. Open an issue to discuss your approach
+3. Submit a pull request
+
+## Versioning
+
+- **v0.1.0** - Initial release with AgentCore runtime support
+- **v0.2.0** - IaC support (CDK, Pulumi, CloudFormation)
+- **v0.3.0** - Terraform modules (planned)
+- **v0.4.0** - ECS/Fargate support (planned)