docs(product): intelligent org exploration and Buzz additions

[n0umen0n]

Summary

• Add the intelligent-org exploration (what intelligent means, Shaper / DRI, Buzz vs Hypha).
• Add the Buzz fork additions (Shapers chat, talk→work, My Work / All Work / Org).
• Add the memory architecture note that sits next to those product briefs.

Test plan

• Read the three docs on this branch and confirm they are the latest versions.
• Confirm feat/signals/board-usability is unchanged.

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