export create_target and add a new mode

[pearsonca]

No description provided.

[Copilot]

Pull request overview

This PR makes create_target() a public API and extends target generation with a new "snapshot" mode, while also applying some test/style formatting cleanups.

Changes:

• Export create_target() and extend mode to include "snapshot".
• Implement "snapshot" behavior in internal_target_builder_vec() and add corresponding tests.
• Reformat several tests and a few code blocks for readability.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
R/imuGAP.R	Adds "snapshot" mode, exports create_target(), and includes minor formatting changes.
NAMESPACE	Exports create_target().
tests/testthat/test-create-target.R	Adds tests for "snapshot" mode and reformats some expectations.
tests/testthat/test-sampling-smoke.R	Reformats an expect_false() call.
tests/testthat/test-extract-imugap.R	Reformats mock stanfit construction.
tests/testthat/test-sampling.R	Removes an extraneous leading line.
tests/testthat/test-predict.R	Removes an extraneous leading line.

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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