Agenda and meeting minutes for 2025-10-16 (#353)

This adds the agenda and minutes for the 2025-10-16 working group
meeting.

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Co-authored-by: Justin Bogner <mail@justinbogner.com>

Author: llvm-beanz

meetings/2025-10-16.md

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+---
+title: 2025-10-16 - HLSL Working Group Minutes
+---
+
+* Discussion topics
+  * @bogner provided status on the cbuffer work - the frontend parts are stable at this point and he'll be putting up PRs for review. The work is unfortunately difficult to split into smaller pieces
+  * There is still need for review on @keenuts's semantics PRs. @tex3d will circle back to those.