ARR: Validate camera-ready against TeX/Markdown

[haroldrubio]

This PR creates two files to perform TeX/Markdown validation for a submission revision stage, typically the camera-ready revision

Edit: Waiting on feedback from ARR before proceeding with implementation

[Copilot]

Pull request overview

Adds camera-ready (submission revision stage) validation to disallow TeX and Markdown markup in title/abstract, along with an integration test that configures and exercises the new preprocess behavior in an ARR venue workflow.

Changes:

• Extend test_commitment_venue to create a Camera_Ready_Revision stage, attach revision preprocess scripts, and verify rejection/acceptance cases.
• Add a JS preprocess wrapper that loads revision_preprocess_script from the meta invitation and executes it.
• Add the actual validation script that detects TeX/Markdown patterns in title and abstract and raises user-facing errors.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
tests/test_arr_venue_v2.py	Adds end-to-end coverage for camera-ready revision validation and expected error behavior.
openreview/arr/process/camera_ready_preprocess.js	JS preprocess wrapper that fetches and executes revision_preprocess_script from the meta invitation.
openreview/arr/process/camera_ready_preprocess_content.js	Implements TeX/Markdown detection rules for title/abstract and returns OpenReviewErrors on violations.

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