refactor(ata): own fixed-form greedy assembly in Rust

[seonghobae]

Why

Draft #747 is a RED ownership contract (test-only). Production fixed-form assembly still runs the greedy heuristic in Python.

What

• Rust mlsirm_core::test_form::assemble_test_form_greedy owns ordering, exclusion, and content min/max feasibility look-ahead
• PyO3 assemble_test_form_greedy binding on _core
• Public assemble_test_form validates/marshals only and transports Rust results
• Ownership sentinel + Rust unit tests + existing design suite parity
• Changelog fragment + APA 7th doctoring (van der Linden 2005)

Verification

• cargo test -p mlsirm-core --lib test_form (5 pass)
• pytest tests/test_test_form_rust_ownership.py tests/test_cov_a_test_design.py (16 pass)
• pytest tests/test_irt_stability.py -k assemble (1 pass)

Supersedes #747 once product gates are green.

changelog

See docs/changelog.d/747-test-form-rust-ownership.md and Unreleased Fixed.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8a56d7b and e2909fd.

📒 Files selected for processing (8)

• CHANGELOG.md
• crates/fast-mlsirm-py/src/lib.rs
• crates/mlsirm-core/src/lib.rs
• crates/mlsirm-core/src/test_form.rs
• docs/changelog.d/747-test-form-rust-ownership.md
• docs/doctoring/test_form_rust_ownership.md
• python/fast_mlsirm/test_design.py
• tests/test_test_form_rust_ownership.py

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