academic-paper: citation-check has no trigger phrases in the SKILL.md description (fires 3 of 6 on plain-language prompts)

Summary

academic-paper/SKILL.md lists trigger phrases in its description for most modes (write paper, parse reviews, should we push back, audit my rebuttal, AI disclosure, and the zh-TW / ko equivalents) but carries nothing for citation-check. The only "check citations" / "verify references" phrases live in MODE_REGISTRY.md, which the skill router does not read at trigger time.

Evidence

Plain-language citation-check prompts in an eval pilot (plugin-evals-citation-check/, sonnet, 1 run each):

Prompt shape	Fired?
"Please run a citation check on this manuscript excerpt. Target style is APA 7 …" (en)	yes
"請幫我檢查這篇稿子的引用。格式是 APA 7 中文版 …" (zh-TW)	yes
"Check the citations in this manuscript excerpt. IEEE style …" (en)	no
"can you look over the refs in this? …" (en, terse)	no
"Por favor revisa las citas de este fragmento de manuscrito. Estilo APA 7 …" (es)	no, see #850
"Could you check the citations in this section? Chicago notes-bibliography …" (en)	yes

3 of 6 fired. The same skill-fired indicator for the revision-coach suite went from 0/2 to 7/7 after #851 added the missing rebuttal phrases to the description, so this is the same class of fix.

Proposed fix

Add conservative, intent-specific phrases to the academic-paper description: check citations, citation check, check my references, verify references, look over the refs, plus zh-TW 檢查引用, 引用檢查, 檢查參考文獻, 核對文獻, and the ko equivalents that already exist for other modes. Keep the #452/#509 rule: no broad standalone words.

Re-run the eval suite's skill-fired indicator afterwards; the six fire cases are the acceptance check.