fix(cargo-gamma-unsafe): avoid clippy::fn_to_numeric_cast_any on the MSRV toolchain

[Pato Sandaña (psandana)]

What broke

The OxidizerOxToolsGitHub.PublishEachCommit run 40252163 failed on main (95089c5, "Introduce cargo-gamma (#93)") in two independent places:

1. Cargo clippy -- Build and Test {dev,release} on linux

   error: casting function pointer `record` to `*const ()`
     --> crates/cargo-gamma-unsafe/src/interrupt.rs:683:62
     = note: `-D clippy::fn-to-numeric-cast-any` implied by `-D warnings`
   

2. Guardian: Post Analysis -- SDLSources

   ESLint Error @microsoft/sdl/no-inner-html
     crates/cargo-gamma-lib/src/vendor/mutation-test-elements.js (lines 2, 4, 89)
   Guardian exited with an error exit code: 8
   

Root causes and fixes

1. clippy fn_to_numeric_cast_any (MSRV-only)

The publish pipeline builds with RUST_MSRV = 1.95 (constants.env), and clippy 1.95 flags the record as *const () sub-cast in the dying_resets_the_disposition_to_the_default_before_re_raising test. Clippy 1.97 (RUST_LATEST) no longer flags the pointer form, which is why it passed the RUST_LATEST checks and only broke on the MSRV leg.

Fixed by widening the handler the way the production install_with and the sibling every_terminal_signal_is_armed_to_survive_its_own_delivery test already do -- record as extern "C" fn(i32) as usize under #[expect(clippy::fn_to_numeric_cast_any, ...)]. That form trips the lint identically on 1.95 and 1.97, so the expectation stays fulfilled on both toolchains.

2. SDL ESLint no-inner-html on vendored JS

mutation-test-elements.js is the minified mutation-testing-elements 3.9.0 bundle, vendored and inlined via include_str! for offline report rendering. The SDL ESLint tool (which runs with --no-ignore, so a plain .eslintignore is not honored) flags its innerHTML/insertAdjacentHTML usage and breaks Guardian.

Fixed by adding the repo-root guardian_baselines.gdnbaselines the pipeline already looks for -- it logged "Baselines file expected at ...\guardian_baselines.gdnbaselines but not found" -- mirroring ox-sdk. It baselines exactly those three findings by the Guardian signatures the failing run emitted.

Reproduction and verification

• Installed the matching toolchain and reproduced the exact clippy error with clippy 0.1.95 targeting x86_64-unknown-linux-gnu (the interrupt module is #[cfg(unix)], so it only surfaces on the linux leg; the windows legs were green).
• After the fix, cargo clippy --all-targets --all-features -- -D warnings on cargo-gamma-unsafe is clean on 1.95 and 1.97, dev and release (linux target).
• cargo +nightly-2026-01-21 fmt --check and cargo heather (license headers) both pass.

Fixes the failures in build 40252163.

/cc Martin Taillefer (@geeknoid)

[Copilot]

Pull request overview

This PR fixes two pipeline breaks introduced with cargo-gamma: an MSRV-only clippy lint in cargo-gamma-unsafe tests and a Guardian SDL ESLint failure on a vendored JS bundle used by cargo-gamma-lib.

Changes:

• Adjusts the test-only signal-handler cast to match the production install_with approach and keep clippy::fn_to_numeric_cast_any expectations stable across MSRV/latest.
• Adds a repo-root guardian_baselines.gdnbaselines to baseline SDL ESLint @microsoft/sdl/no-inner-html findings originating from the vendored, minified mutation-test-elements.js bundle.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
guardian_baselines.gdnbaselines	Adds Guardian baselines for ESLint findings on vendored JS to unblock SDLSources in Guardian.
crates/cargo-gamma-unsafe/src/interrupt.rs	Updates a test to use a consistent, expected function-to-integer handler conversion for libc::signal on MSRV clippy.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.7%. Comparing base (95089c5) to head (79cda22).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #112   +/-   ##
=====================================
  Coverage   97.7%   97.7%           
=====================================
  Files        286     286           
  Lines      62174   62175    +1     
=====================================
+ Hits       60751   60753    +2     
+ Misses      1423    1422    -1     

Flag	Coverage Δ
linux	94.5% <100.0%> (?)
linux-arm	94.5% <100.0%> (?)
windows	94.7% <ø> (?)

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