Fix #582: Use primarycensored dependency resolution for Stan function loading

[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

• Replace pcd_load_stan_functions() (loads all functions) with explicit pcd_load_stan_functions(c("primarycensored_lpmf", "primarycensored_ode", "dist_lcdf", "primary_lpdf"), dependencies = TRUE) to use primarycensored's automatic dependency resolution
• Includes ODE/distribution helper functions alongside primarycensored_lpmf to handle the numerical integration fallback path in Stan (needed for compilation even when only analytical solutions are used at runtime)

Test plan

• Linting passes on changed files
• All 72 marginal model tests pass (including Stan compilation and MCMC sampling)
• Full test suite: 427 pass, 3 pre-existing loo integration failures unrelated to changes
• No zero-coverage lines in changed files

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

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ℹ️ Review info

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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1a8a31e7-afe0-4310-bc94-f54cedabf3d7

📥 Commits

Reviewing files that changed from the base of the PR and between 3d6ee3e and 105e7c9.

📒 Files selected for processing (2)

• NEWS.md
• R/marginal_model.R

✨ Finishing Touches

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[seabbs]

LGTM