[LeandroLP23]

What

Closes #4458. Adds a GPUs tested: checklist line to the pull request template and a line in CONTRIBUTING that asks AGC, shader recompiler and VideoOut changes to name each GPU their GPU tests ran on (vendor, model, driver, OS). CI runs those tests only on lavapipe, so the checklist is where a reviewer sees whether only one vendor was covered. #4152 → #4435 is the case that prompted it; #4345 discusses the CI side.

The line is not enforced by check_conventions.py, like Unblocks:.

Tested

Documentation only. python tools/check_conventions.py --base origin/main and python -m unittest discover -s tools/tests pass.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed in TechnicalDebt
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• Unblocks: none
• GPUs tested: n/a
• AI-assisted: yes (Claude Code)

[LeandroLP23]

@AlxcBTW #4590 adds its line to CONTRIBUTING.md at the same place as this PR's line, so whichever merges second hits a one-line conflict. Neither depends on the other, and both lines stay. If #4590 goes in first, I'll rebase this one.

[adriadam10]

Checked the diff against the template and CONTRIBUTING on current main (the #4590 line is already in, no conflict); check_conventions.py doesn't require the new line and Conventions is green on this head. Merging.