test(inference): close nonfinite uncertainty review evidence gaps

[seonghobae]

Post-merge review-completeness correction

Protected main at branch creation: 3bc1222bf9552bb74f98cf34c89eba0b8d29c0dc.

PR #725 correctly landed the production behavior: non-finite Hessians fail closed and non-finite covariance diagonals are preserved instead of becoming false zero uncertainty. A valid current-head CodeRabbit review identified two evidence gaps that remained after that protected merge:

1. the Python/Rust regressions asserted NaN and +∞ but not -∞, despite the public/Rust contract explicitly promising signed-infinity preservation; and
2. the doctoring cited references without stable links or source-specific rationale for the uncertainty/reporting and floating-point representation decisions.

Bounded correction

• add symmetric -∞ preservation assertions to public Python↔Rust parity and the Rust unit contract;
• add stable official source links and source-specific rationale for AERA/APA/NCME uncertainty/interpretation governance, NIST standard-uncertainty guidance, and Rust's primary f64 NaN/±∞ representation documentation;
• explicitly state that preserving non-finite sentinels is a repository safety/representation decision rather than falsely attributing that exact IEEE-754 policy to the measurement sources.

No production numerical code, estimator semantics, dependencies, workflow, version, or release behavior changes in this slice. The finite-negative-diagonal clamp remains accepted compatibility behavior; changing it would require a separate scientific/API decision.

Require focused inference tests, Rust workspace/PyO3, Python 3.12/3.14 and all ordinary package/security gates on one unchanged head before merge. This closes the still-valid review findings from #725 without reopening the already-merged production correction.

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[seonghobae]

Superseded by #730. Fresh comparison shows both branches target the same post-#725 non-finite uncertainty evidence gap. #730 now contains the signed -∞ Rust/Python regressions, current rendered CHANGELOG, and the non-duplicative AERA/NIST/Rust/source-specific doctoring rationale from this branch. No checks or reviews transfer across heads. Closing this Draft to preserve one canonical merge path.