Write-up 11th Ave NE -> Ravenna proposal

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The issue title suggests a proposal about a specific location (11th Ave NE to Ravenna) for the A/B Street project. Since the issue body is empty, start by exploring the repository's existing documentation to understand the format and context for such proposals. Look for similar proposal documents or templates in the docs. 'Done' would be creating a clear written proposal in the appropriate location and format.

Written by the indexing model from the issue text.