Text-only positioning: replace multimodal tag, finalize model allowlist

SHA256SUMS

@@ -4,7 +4,7 @@ d6ff8882ff611446c9a5f78f805932853f978e7a1f07ea0811522f3a9f9bee24  .gitignore
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 41003d4a74749c0220e33dd415042164b5a1093ed401f36277234f772d22d3d0  LICENSE
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-21f988b62fbb8d9d3d1fe9745da6e79682aa36dccb85eef722eb15e56a7cb5c7  README.md
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 6c166d2f088aa3dddd26b1750d12ba000761a80006107cfde709f37a4fd82fe4  backbone/config.json
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@@ -54,7 +54,7 @@ d0dc457b95bdabe519ed0229ef9b0180a91af89054317985e24d7213eafe722a  reference_resu
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