[WIP] Move capShape commits to a new branch

[Copilot]

✅ capShape Feature Successfully Moved to Clean Branch

• Analyze current repository state and understand the capShape feature
• Identify all capShape-related file changes
• Create a new branch based on 9.1-dev (latest development branch)
• Extract and apply capShape changes to the clean branch
• Squash all capShape changes into a single commit
• Add documentation for the branch
• Final branch ready for PR to upstream repository

✨ COMPLETED SUCCESSFULLY

Branch: copilot/move-capshape-commits
Base: 9.1-dev (commit a287eba - CARTO: Implement QuadbinHeatmapTileLayer)
Feature Commit: bc634b9 - "feat: Add capShape property to ColumnLayer for customizable column tops"

Changes (2 files only):

• modules/layers/src/column-layer/column-layer.ts - Add capShape property and parameter passing
• modules/layers/src/column-layer/column-geometry.ts - Implement geometry generation for flat/rounded/pointy caps

capShape Feature:

Adds customizable column tops to ColumnLayer:

• 'flat': Default flat top (existing behavior, backward compatible)
• 'rounded': Dome-like rounded top for buildings/structures
• 'pointy': Cone-like pointed top for peaks/mountains

✅ Ready for PR to visgl/deck.gl!

No mapstate changes or other unrelated code included - this is a clean, focused feature branch ready to be submitted as a pull request to the upstream repository.

Original prompt

Move the capShape commits in this repo to a branch that doesnt have the mapstate changes and squash em all together so I can create a PR in the source repo

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