Add ACM SIG variant: appearance order, no bib nums

[SLEEX]

Description

This PR adds a functional variant of the ACM SIG Proceedings style specifically optimized for researchers using word processors (like Microsoft Word) for academic typesetting[cite: 1].

Source and Derivation:
This style is derived from the official acm-sig-proceedings style[cite: 1]. It maintains the core metadata while modifying the bibliography logic to solve specific formatting pain points in Human-Computer Interaction (HCI) and technology-related publications[cite: 1].

Key Changes and Rationale:

• Order of Appearance: Removed the <sort> block from the bibliography to ensure references are listed by the order of appearance[cite: 1]. This fixes the issue in the parent style where alphabetical sorting leads to out-of-sequence numeric callouts (e.g., [10] appearing before [2])[cite: 1].
• No Bibliography Numbers: Removed the citation-number variable from the bibliography layout[cite: 1]. This prevents redundant numbering and avoids the need for manual "unlinking" or deletion of fields in Word, which is often required to meet specific venue formatting guidelines[cite: 1].
• Hanging Indent: Enabled hanging-indent="true" to provide a clean, professional visual alignment for the reference list in the absence of numbered labels[cite: 1].

Checklist

• Check that you've added a link to the style you used as a template in the <info> block at the beginning of the file with rel="template".[cite: 1]
• Check that you've added a link to the style guidelines with rel="documentation".[cite: 1]
• Check that you've added yourself as the <author> of the style or <contributor> for a style update.[cite: 1]
• Check that you've used the correct terms or labels instead of hardcoding into affixes (e.g., <text variable="page" prefix="pp. "/>).[cite: 1]
• Check that you've not used <text value="... if not absolutely necessary.[cite: 1]
• Check that you've not changed line 1 of the style.[cite: 1]

[github-actions]

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[github-actions]

😃 Your submission passed all our automated tests.

Below are some sample citations generated based on your proposed changes:

acm-sig-proceedings-no-bib-number.csl (new)

[2, 4]
[1, 5]
[3]

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CSL search by example: 2012. https://editor.citationstyles.org/searchByExample/. Accessed: 2012-12-15.
Fenner, M. et al. 2019. A data citation roadmap for scholarly data repositories. Scientific Data. 6, (Apr. 2019). https://doi.org/10.1038/s41597-019-0031-8.
Galindo-Castañeda, T. et al. 2025. Locating the microbes along the maize root system under nitrogen limitation: a root phenotypic approach. Annals of Botany. 136, 5–6 (Oct. 2025), 1143–1162. https://doi.org/10.1093/aob/mcaf185.
Hancké, B. et al. eds. 2007. Beyond varieties of capitalism: conflict, contradictions, and complementarities in the European economy. Oxford University Press.
Mares, I. 2001. Firms and the welfare state: when, why, and how does social policy matter to employers? Varieties of capitalism: the institutional foundations of comparative advantage. P.A. Hall and D. Soskice, eds. Oxford University Press. 184–212.

[POBrien333]

I assume this was generated with AI.

This part doesn't make sense to me:
"No Bibliography Numbers: Removed the citation-number variable from the bibliography layout[cite: 1]. This prevents redundant numbering and avoids the need for manual "unlinking" or deletion of fields in Word, which is often required to meet specific venue formatting guidelines[cite: 1]."

What is this style for? Which journal?