Fix workflow dependency installation

[M-Colley]

Summary

• run the workflow dependency installation step inside an R shell so install.packages() executes successfully
• ensure easystats is preinstalled alongside the other test dependencies so sourcing r_functionality.R no longer fails

Testing

• Not run (R is not available in the execution environment)

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Install curl before running tests

The workflow step at lines 15‑21 only installs a handful of CRAN packages before running the suite, but the helper sets options(rcode.auto_install = FALSE) so tests rely entirely on the packages preinstalled here. The new basic utility helpers behave test (tests/testthat/test_r_functionality.R:97‑99) stubs curl::has_internet via with_mock. On a clean runner where the curl package isn’t already available (it’s not a recommended/base package), referencing curl::has_internet fails before the mock is applied, so the tests abort and the workflow can never turn green. Please add curl (and any other packages referenced directly in the tests) to this install.packages list so CI reliably succeeds.

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