[Idea] Add a real-world debugging use case

[sabahattinkalkan]

Summary

Add a practical debugging-focused use case that demonstrates how Antigravity can be used
to reason about, isolate, and resolve issues in an existing codebase.

Problem It Solves

Most AI-assisted workflows focus on greenfield development.
However, real-world engineering often involves debugging unclear, partially broken systems.
There is currently no concrete example showing how Antigravity handles this scenario.

Proposed Approach

Introduce a step-by-step use case where:

• The problem is unclear at first
• Roles are assigned for investigation vs decision-making
• A workflow guides hypothesis → validation → resolution
• AI is used as an assistant, not the decision owner

Scope

• Agent
• Workflow
• Skill
• Documentation

Additional Context

This would help developers understand how Antigravity applies beyond planning
and into maintenance and debugging workflows.