[MAINT] update completed BEPs

[Remi-Gau]

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📚 Documentation preview 📚: https://bids-website--793.org.readthedocs.build/en/793/

[Remi-Gau]

main changes will appear there: https://bids-website--793.org.readthedocs.build/en/793/extensions/beps.html#merged-beps

tangentially related: wonder if the eye tracking pre-print (https://www.biorxiv.org/content/10.64898/2026.02.03.703514v1) should be mentioned in the spec: https://bids-specification.readthedocs.io/en/latest/introduction.html#datatype-specific-publications

@julia-pfarr

https://bids-website--793.org.readthedocs.build/en/793/extensions/beps.html#merged-beps

[effigies]

@christinerogers was going to be communicating with BEP21 about its status in the coming weeks (possibly already started). Let's back out that change for now.

[Remi-Gau]

@christinerogers was going to be communicating with BEP21 about its status in the coming weeks (possibly already started). Let's back out that change for now.

was about to revert as the PR was reopened by Cyril

[julia-pfarr]

tangentially related: wonder if the eye tracking pre-print (https://www.biorxiv.org/content/10.64898/2026.02.03.703514v1) should be mentioned in the spec: https://bids-specification.readthedocs.io/en/latest/introduction.html#datatype-specific-publications

Sure, why not! You want to do an extra PR for that or should I make a change in this PR?

[effigies]

We should also move BEP 004 to withdrawn (bids-standard/bids-specification#1566) but that can be a different PR.