chore: Evaluate and decide on how to handle intent detection flow and unused code path

[scottrigby]

During SecureBuild integration, I found that while ChartSmith has two separate code paths for plan creation, only one is actually used in the current UI design.

We should decide on how to handle this.

I made an initial evaluation Google doc, open for anyone with the link to comment: https://docs.google.com/document/d/1OfAiYiE-Ib-BZa4AQiPkvN5HN4lAKM2_abUBopivd-E/edit?usp=sharing

[scottrigby]

may also be good to reference #97