Reflexive Domain Modeling: replace placeholder citations #5

Reflexive Domain Modeling 0.1.0 cites three placeholder references: example2024, conference2023 and textbook2022.
They appear in the published PDF (https://civic-studio.s3.us-west-1.amazonaws.com/assets/docs/reflexive-domain-modeling-v0.1.0.pdf) and on https://civic.studio/papers/reflexive-domain-modeling/.

To do

• Replace each with a real source in references.bib, or remove the claim that cites it.
• Bump to 0.1.1 with a CHANGELOG.md entry, rebuild the PDF, upload reflexive-domain-modeling-v0.1.1.pdf.
• Run bin/sync-papers reflexive-domain-modeling in the website repo, commit, push.

Done when

• No placeholder keys remain in the manuscript, the PDF or the page.