test(cat): preserve public selection input immutability

[seonghobae]

Why

PR #741 moved public CAT item information and final next-item selection into Rust/PyO3, but stale predecessor #735 carried a non-duplicative caller-array immutability regression that did not land with the production migration. Issue #629 explicitly requires immutable public marshalling.

What

Add current-main regression coverage proving item_information() and select_cat_item() do not mutate caller-provided theta, factor-map, or administered-item arrays while exercising the installed Rust-backed public path.

No numerical formula, selection policy, dependency, workflow, provider, documentation authority, version, or release behavior changes.

Acceptance

Require focused/full Python 3.12/3.14 plus applicable repository CI/Security/SAST review gates on one unchanged head. After protected integration this PR absorbs the remaining valuable verification delta from stale Draft #735, allowing #735 to close without losing evidence. Advances #629.

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 287f06dd-dd1c-48ea-90f5-a8ed8944fa7c

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[seonghobae]

Superseded by clean current-main Draft #749. Fresh exact evidence before replacement: #745 head 0cc214165d6753d90b8233c9b717acc0fe8a4d6b is three protected-main commits behind and its only changed path is tests/test_cat_selection_input_immutability.py. #749 was recreated from protected main cd9e55f7f1735e9d73e73c11f5790d3c8e2f2b55 and preserves that test file byte-for-byte on head 631aab89fb4b477231e37ad7f5a51c12d69154bd. No checks/reviews/approval from #745 transfer; #749 must earn fresh exact-head/live-base evidence.