refactor(ata): rebase fixed-form Rust ownership RED on current main

[seonghobae]

Why

Protected main advanced three commits after Draft #747 was created. #747's only unique delta is the intentional public-boundary RED for fixed-form greedy assembly ownership, so this clean-lineage replacement recreates that exact contract on current protected main without transferring predecessor checks/reviews.

Intentional RED

tests/test_test_form_rust_ownership.py replaces proposed _core.assemble_test_form_greedy with a sentinel valid form and requires public assemble_test_form() to return it while preserving caller information/content/exclusion arrays. Current Python-owned ordering/content-feasibility logic should fail the delegation assertion after normal Rust/PyO3 package setup.

Exact identity

• protected base at creation: cd9e55f7f1735e9d73e73c11f5790d3c8e2f2b55;
• clean replacement head: ba9685b965c64a170ff5ca566f750d3ae4225769;
• changed path: tests/test_test_form_rust_ownership.py only.

Minimum GREEN

Move descending finite-information ordering, exclusion filtering, deterministic ties, content minima/maxima and look-ahead feasibility into one bounded mlsirm-core kernel. Expose thin PyO3 marshalling; Python validates/types/canonical content labels and transports only. Preserve current deterministic behavior and fail closed when compiled capability is absent. Add direct parity/resource/adversarial/immutability evidence, docs/rustdoc and changelog after GREEN, then one unchanged head with Python 3.12/3.14, Rust/PyO3, package/reinstall, existing GPU/fuzz, Security/SAST and current-head governance gates.

No stronger ATA optimizer, provider, hosted state, workflow/dependency/version/release or competing canonical docs belongs here. Advances #629. Supersedes #747 once this clean replacement is established.

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[seonghobae]

Superseded by GREEN ownership PR (#753 form assembly / #755 linking). Closing RED test-only refresh.

[seonghobae]

Superseded by clean current-main Draft #756.

Fresh lineage evidence:

• protected main: 8a56d7b1b024e18a5a96a94db4ede1bf6648ead1;
• refactor(ata): rebase fixed-form Rust ownership RED on current main #750 exact head ba9685b965c64a170ff5ca566f750d3ae4225769 is diverged ahead 1 / behind 3;
• its sole unique delta is tests/test_test_form_rust_ownership.py;
• replacement refactor(ata): refresh fixed-form Rust ownership RED on current main #756 exact head e8cd669de25ea5344b82890694ddc6d2b3bd55a2 is a direct one-commit descendant of current protected main;
• predecessor and replacement test files have identical blob SHA c63dace80d9c5b6afd7919a1e5d60fcf722d207a.

No #750 checks/reviews/approval/base-sensitive evidence transfers. #756 is now the sole current-lineage implementation/RED authority for the fixed-form assembly ownership slice. Closing this stale duplicate drops no unique value.