fix: compatibility with primarycensored >= 1.4.0

[seabbs-bot]

Summary

• Adds missing L (left truncation) parameter to the primarycensored_lpmf Stan call in the marginal model template, fixing Stan compilation failures with primarycensored >= 1.4.0
• Adds primarycensored (>= 1.4.0) version bound to DESCRIPTION
• Extends check-cmdstan CI workflow to also check marginal model Stan syntax (previously only checked the latent model, which is why this breakage wasn't caught)

Context

primarycensored 1.4.0 added left truncation support via a new L parameter in all Stan function signatures. This changed primarycensored_lpmf from 8 to 9 arguments, breaking epidist's marginal model for all users. This PR hardcodes L = 0 (no left truncation) to restore compatibility. Full left truncation support is tracked in #588.

Closes #583

Test plan

• Stan code generates successfully with epidist_stancode()
• Stan code passes rstan::stanc() type checking
• Unit tests pass (0 failures, 222 passed)
• Lint clean (no new warnings in changed files)
• R-side code (dpcens/rpcens calls in gen.R) already uses named arguments so is unaffected

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

Summary by CodeRabbit

Chores

• Updated minimum version requirements for external package dependencies to maintain compatibility with the latest available features and improvements.
• Enhanced continuous integration validation processes with comprehensive consistency checks.

Bug Fixes

• Fixed a parameter handling issue in core statistical computations that could potentially affect result accuracy.

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Walkthrough

The PR updates epidist to support the new left-truncation parameter (L) added to the primarycensored package. It bumps the primarycensored dependency to version 1.4.0, inserts an explicit 0 for the L argument in the Stan model's primarycensored_lpmf function call, and separates workflow validation steps for latent and marginal models.

Changes

Cohort / File(s)	Summary
Workflow validation .github/workflows/check-cmdstan.yaml	Renamed "Compile model and check syntax" step to "Check latent model syntax" and added new "Check marginal model syntax" step with separate validation logic for the marginal model variant.
Dependency update DESCRIPTION	Bumped primarycensored dependency from unversioned to minimum version constraint (>= 1.4.0).
Stan function signature inst/stan/marginal_model/functions.stan	Added explicit 0 argument to primarycensored_lpmf call after y_upper parameter to accommodate new left-truncation L parameter in primarycensored 1.4.0+.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related issues

• Add support for left truncation adjustment in delay tooling #584: Directly corresponds to the primarycensored API change for the new L parameter; this PR implements the required updates to function calls.
• Support left truncation (L parameter) from primarycensored #588: Related to properly handling the left-truncation parameter by hardcoding it as 0 in Stan model templates, consistent with the compatibility approach.

Poem

🐰 A parameter hops into the fold,
The L for truncation, brave and bold!
With zero passed and versions set,
Our marginal models safely bet!
Dependencies aligned with care,
The future's truncation, standing fair! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main purpose of the PR: adding compatibility with primarycensored >= 1.4.0 by updating the package to handle the new L parameter.
Linked Issues check	✅ Passed	The PR fully addresses the coding requirements from issue #583: updates the Stan call to include the L parameter, updates the DESCRIPTION version constraint, and extends CI checks for marginal model syntax.
Out of Scope Changes check	✅ Passed	All changes are directly related to issue #583 requirements: Stan function signature updates, version constraints, and CI workflow enhancements for validation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Review ran into problems

🔥 Problems

Timed out fetching pipeline failures after 30000ms

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[seabbs]

This looks good to me but is only a patch fix so we should go on to add support for left truncation for users.