Create devcontainer setup for running HyperView on GitHub Codespaces

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Overview

Set up a development container (devcontainer) configuration that allows HyperView to be easily run on GitHub Codespaces. This will help contributors start developing instantly without complex environment setup and improve onboarding.

Tasks

• Create a .devcontainer directory in the repo root
• Add devcontainer.json or devcontainer.yaml specifying required tools, extensions, and environment variables
• Ensure support for all dependencies needed to run and develop HyperView
• Test Codespace spin-up to validate environment works out-of-the-box
• Document usage in project README (or devcontainer/README.md)

Acceptance Criteria

• Codespace launches and HyperView works with a single click
• Docs updated and verified

References

• GitHub Docs: devcontainers
• Sample devcontainer spec

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Feel free to suggest additional tooling or improvements for Codespace setup.