docs(adr): accepted mirt fit-search decisions

[seonghobae]

Draft only. Do not merge. Do not mark Ready.

Branched from current develop (5128d48), not stacked on #79 (feat(recovery): five-repeat AEFA true-parameter RMSE protocol) or #80 (feat(recovery): nested mixedmirt random-effect RMSE evidence).

Docs only. No R/src, tests, Shiny, DESCRIPTION, NAMESPACE, or workflow changes. docs/papers/README.md remains the formula provenance note; docs/adr/ records accepted decisions already true on develop.

What this adds

• docs/adr/README.md index
• ADR 0001–0006 (Status: Accepted, Date: 2026-08-25)
• One-line pointers in ARCHITECTURE.md, README, and docs/papers/README.md

NEWS.md has no Unreleased section, so it was left unchanged. No CHANGELOG.md.

Verification

npx -y markdownlint-cli2@0.20.0 passes on docs/adr/, ARCHITECTURE.md, and docs/papers/README.md. Pre-existing README lint findings were not rewritten.

Locator table (live-checked 2026-08-25)

Use these exact APA 7th entries. Crossref titles/authors MATCH. Do not drop a required locator. Do not add unlisted papers.

Source	Locator	Live-check
Chalmers, R. P. (2012). mirt: A multidimensional item response theory package for the R environment. Journal of Statistical Software, 48(6), 1–29.	https://doi.org/10.18637/jss.v048.i06	DOI → JSS article HTTP 200. MATCH.
Drasgow, F., Levine, M. V., & Williams, E. A. (1985). Appropriateness measurement with polychotomous item response models and standardized indices. British Journal of Mathematical and Statistical Psychology, 38(1), 67–86.	https://doi.org/10.1111/j.2044-8317.1985.tb00817.x	DOI resolves (publisher page CF 403). Crossref MATCH.
Orlando, M., & Thissen, D. (2000). Likelihood-based item-fit indices for dichotomous item response theory models. Applied Psychological Measurement, 24(1), 50–64.	https://doi.org/10.1177/01466216000241003	DOI resolves to Sage (CF 403). Crossref MATCH.
Maydeu-Olivares, A., & Joe, H. (2014). Assessing approximate fit in categorical data analysis. Multivariate Behavioral Research, 49(4), 305–328.	https://doi.org/10.1080/00273171.2014.911075	DOI → T&F HTTP 200. MATCH.
Hurvich, C. M., & Tsai, C.-L. (1989). Regression and time series model selection in small samples. Biometrika, 76(2), 297–307.	https://doi.org/10.1093/biomet/76.2.297	DOI resolves to OUP (CF 403). Crossref MATCH.
Spiegelhalter, D. J., Best, N. G., Carlin, B. P., & van der Linde, A. (2002). Bayesian measures of model complexity and fit. Journal of the Royal Statistical Society: Series B, 64(4), 583–639.	https://doi.org/10.1111/1467-9868.00353	DOI resolves to JRSSB (CF 403). Crossref MATCH.
Wright, B. D., & Masters, G. N. (1982). Rating scale analysis. MESA Press.	book; no DOI	Do not invent a DOI.

Wright & Masters is cited as a book with no DOI.

  

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