Issue 73: Smooth using custom prior configs and a new vignette

[SamuelBrand1]

This pull request makes it easier to configure Gaussian Process (GP) priors in the make_and_fit_model function, and add a vignette for this.

API Improvements and Configuration Flexibility

• The make_and_fit_model function now accepts a config keyword argument, allowing users to pass a custom GPConfig for specifying GP prior structure and hyperparameters. All other keyword arguments (such as n_mcmc, n_hmc, hmc_config, etc.) are forwarded directly to AutoGP.fit_smc!, simplifying the interface and making it more flexible.
• The GPConfig type is now re-exported for convenience, making it easier for users to construct and pass custom configurations.

Documentation and Examples

• The documentation for make_and_fit_model is expanded with detailed explanations and code examples showing how to customize GP priors using GPConfig, including how to update nested prior entries and leverage the Accessors.jl package for convenient configuration edits.

[Copilot]

Pull request overview

This PR expands NowcastAutoGP’s model-fitting API to make Gaussian Process prior customization easier by allowing callers to pass an AutoGP GPConfig into make_and_fit_model, and adds a new documentation vignette demonstrating prior editing (including Accessors.jl workflows).

Changes:

• Add config support in make_and_fit_model and forward it into AutoGP.GPModel, while forwarding remaining kwargs to AutoGP.fit_smc!.
• Re-export GPConfig from the top-level NowcastAutoGP module and add tests verifying config forwarding.
• Add a new “setting-priors” vignette and wire it into the docs build and docs environment.

Reviewed changes

Copilot reviewed 9 out of 12 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
test/test_gpconfig.jl	Adds tests to validate that config is forwarded into the created GPModel.
src/NowcastAutoGP.jl	Re-exports GPConfig for user convenience.
src/make_and_fit_model.jl	Updates make_and_fit_model to accept/forward config and to pass through fit_smc! kwargs.
docs/vignettes/setting-priors.jl	New Literate vignette showing how to modify priors (incl. Accessors.@set).
docs/src/vignettes/setting-priors.md	Generated markdown output for the new vignette.
docs/Project.toml	Adds Accessors to the docs environment dependencies.
docs/make.jl	Adds the new vignette to the rendered docs pages list.
docs/make_vignettes.jl	Updates vignette generation list to include the new vignette.
.github/copilot-instructions.md	Updates internal contribution guidance/examples to reflect the new config usage and passthrough kwargs behavior.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.68%. Comparing base (dfcb1ee) to head (15a2c59).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   95.68%   95.68%           
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  Files           5        5           
  Lines         139      139           
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  Hits          133      133           
  Misses          6        6           

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