test: verify iterative AD with eval() mid-loop (#654)#656
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Add integration tests for scalar fixed-point iteration x_{k+1} = a*cos(x_k)
where eval() is called mid-loop for convergence checks and grad()
differentiates through all unrolled iterations.
Verifies: graph continuity after eval(), gradient correctness vs finite
differences, eval_all correctness for primal+gradient, and linear graph growth.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
tenferro/tests/iterative_ad.rsverifying that iterative AD works correctly wheneval()is called mid-loop for convergence checksx_{k+1} = a * cos(x_k)with parameteraTest plan
cargo test -p tenferro --test iterative_ad --release)cargo test --workspace --release)cargo fmt --all --check)cargo doc --workspace --no-deps)buffer_pool.rsfailure unchanged)Closes #654
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