AC Assignments: Add assignment limit to area chairs

[haroldrubio]

• Resolves ARR: Prevent multiple meta-reviews from being posted #2988

This PR prevents the ARR issue of multiple meta-reviews by re-using the logic to limit the number of invited and assigned reviewers. By limiting the number of AC assignments, we avoid the issue of multiple meta-reviews by only having 1 AC assigned at a time

[Copilot]

Pull request overview

Adds a per-submission quota for Area Chair (AC) assignments/invitations in ARR to prevent multiple simultaneous AC assignments (and therefore multiple meta-reviews), by reusing the existing quota enforcement mechanism used for reviewer assignments.

Changes:

• Introduces submission_assignment_max_area_chairs as a configurable field (defaulting to 1 for ARR).
• Publishes area_chairs_invite_assignment_id into the venue domain group content so invite/assignment quota logic can apply to ACs.
• Extends ARR v2 tests to assert the new domain settings and verify quota enforcement for AC Assignment and Invite_Assignment edges.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_arr_venue_v2.py	Adds assertions for the new AC quota field and verifies quota enforcement via raised exceptions.
openreview/venue_request/venue_request.py	Exposes submission_assignment_max_area_chairs in revision and request-form schemas (hidden in request form).
openreview/venue/venue.py	Adds submission_assignment_max_area_chairs attribute to the Venue model.
openreview/venue/group.py	Adds area_chairs_invite_assignment_id to domain content and persists submission_assignment_max_area_chairs when set.
openreview/conference/helpers.py	Parses submission_assignment_max_area_chairs from request notes into the Venue/ARR object.
openreview/arr/arr.py	Sets ARR default submission_assignment_max_area_chairs = 1 and copies it into the underlying Venue.

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[celestemartinez]

The changes seem fine. However, the ACs are assigned by the PCs right, so I thought that ARR had assigned two ACs to some papers on purpose? Will this cause any issues for them?

[melisabok]

The changes look good to me but if we want to have a single meta review per submissions we can change the signatures of the meta review to be the SubmissionX/Area_Chairs instead of the anonid, this way any member of this group can sign the note and maxReplies will be limited to 1.

[celestemartinez]

The changes look good to me but if we want to have a single meta review per submissions we can change the signatures of the meta review to be the SubmissionX/Area_Chairs instead of the anonid, this way any member of this group can sign the note and maxReplies will be limited to 1.

But then this also means that if there are multiple ACs , they can all edit the same metareview. I am not sure if this is the behavior we want.

[melisabok]

But then this also means that if there are multiple ACs , they can all edit the same metareview. I am not sure if this is the behavior we want.

True, then the invitee must be the anon AC group.

[haroldrubio]

I'll follow up with ARR to see if they would support something like (multiple ACs, single meta-review)

[haroldrubio]

Update on the requirements from ARR:

• SACs need to keep track of the non-responsive AC, so one way (as they have already been doing) is to keep multiple ACs in the AC group
• There should still only be 1 meta-review, but the meta-review should only be modified by the submitting AC