Fix #534: Add marginal model to model outline document

[seabbs-bot]

This is entirely from an agent so do not review until I have pinged for review as I will do a first pass

Summary

• Adds a new "The marginal model" section to the model guide vignette (vignettes/model.Rmd)
• Describes how the marginal model integrates out latent variables analytically using the primarycensored package
• Signposts to primarycensored vignettes for mathematical details

Changes

• vignettes/model.Rmd: Added marginal model section after the latent model section, covering the shift-invariant likelihood, truncation normalisation, and aggregation advantages

Test plan

• Verify the vignette renders correctly with pkgdown::build_article("model")
• Check cross-references to Section 1.2 (interval censoring) resolve correctly
• Verify LaTeX equations render properly

Closes #534

This was opened by a bot. Please ping @seabbs for any questions.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 0ba25563-195d-415a-87a3-087c3566e67f

📥 Commits

Reviewing files that changed from the base of the PR and between 3d6ee3e and 5b1b50c.

📒 Files selected for processing (3)

• README.Rmd
• vignettes/model.Rmd
• vignettes/references.bib

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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