Split monolithic r2f tests into focused files

[t-kalinowski]

Summary

• Break up the former test-r2f.R into logically grouped unit test files
• Add example test files for real-world algorithms like Viterbi and heat diffusion
• Extract and move related snapshot files alongside their new tests

Testing

• R -q -e "testthat::test_local()"

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https://chatgpt.com/codex/tasks/task_e_68a8f135592c8332a10e27ed0ef565a9

[Copilot]

Pull Request Overview

This PR refactors the monolithic test-r2f.R file into focused, logically grouped unit test files to improve test organization and maintainability.

• Splits the large test-r2f.R file into 15 specialized test files organized by functionality
• Creates example test files demonstrating real-world algorithms (Viterbi, heat diffusion, convolution, rolling mean)
• Moves related snapshot files alongside their new test files

Reviewed Changes

Copilot reviewed 30 out of 31 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/testthat/test-r2f.R	Removes original monolithic test file (1134 lines deleted)
tests/testthat/test-add.R	Addition operations and basic function translation tests
tests/testthat/test-which.R	Tests for which.max and which.min functions
tests/testthat/test-unary-intrinsics.R	Tests for mathematical intrinsic functions (sin, cos, abs, etc.)
tests/testthat/test-size-constraint.R	Tests for array size constraint validation
tests/testthat/test-seq.R	Tests for sequence generation
tests/testthat/test-matrix.R	Matrix creation and implicit size reuse tests
tests/testthat/test-loops.R	Loop construct tests (repeat, while, for, break, next)
tests/testthat/test-logical.R	Logical operations and comparisons
tests/testthat/test-ifelse.R	Conditional ifelse operation tests
tests/testthat/test-hoist-mask.R	Mask hoisting optimization tests
tests/testthat/test-div-mod.R	Modulus and integer division operator tests
tests/testthat/test-declare-type.R	Type declaration syntax variant tests
tests/testthat/test-example-*.R	Real-world algorithm examples (Viterbi, heat diffusion, convolution, rolling mean)
tests/testthat/_snaps/*.md	Snapshot files moved to match new test structure

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