[QualGroup][docs] Document decision-taking process and refresh sync-up materials (#163122)
## Summary
This PR documents the LLVM Qualification Working Group’s decision-taking
process and updates the latest sync-up meeting materials.
## Changes
* Added a new **Decision Taking** section describing:
* Principles (consensus-first, inclusiveness, transparency)Discussion
time limits
* Voting procedure
* Documentation of outcomes
* Updated Meeting Materials with the October 2025 presentation slides.
## Background
The LLVM Qualification Working Group aims to ensure decisions are made
transparently and collaboratively.
This new section documents how proposals are discussed, consensus is
reached, and outcomes are recorded, providing clear guidance for
contributors.
It also keeps the group’s meeting resources up to date for easier
reference and continuity.
## Testing
- [x] Documentation builds successfully
- [x] New “Decision Taking” section renders correctly
- [x] Links and internal references are properly formatted
- [x] Meeting Materials section updated with the October 2025 slides
## Related Links
* [LLVM Qualification Working Group
Documentation](https://llvm.org/docs/QualGroup.html)
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