Outline: Day One in an Unknown Repo (application graph series)

[nithyatsu]

This pull request adds a new draft blog post introducing the experience of exploring a complex, unfamiliar repository using Radius Canvas in the GitHub Copilot app. The post walks through the process of generating and understanding an application model, highlights how the application graph helps developers quickly grasp architecture and dependencies, and provides guidance for getting involved with the Radius community.

New blog post content:

• Added radblog/content/posts/2026/day-one-unknown-repo/index.md, a draft post titled "Day One in an Unknown Repo," which introduces the challenges of understanding a new codebase and demonstrates how Radius Canvas in the GitHub Copilot app can visualize the application's architecture and dependencies.

Key themes covered in the post:

Understanding unfamiliar repositories:

• Describes the difficulty of identifying services, dependencies, and architecture in multi-language, multi-service repos.
• Explains how architecture information is scattered across various files and formats.

Radius Canvas and application modeling:

• Introduces Radius Canvas as a tool for generating an application graph from repository contents, making architecture and dependencies visible and navigable.
• Details how the graph links directly to source code and application definitions for easy exploration.

Getting started and next steps:

• Provides instructions for