ci(gc): run the Windows try-root probe

[proggeramlug]

Windows native-root CI currently requires the try/catch probe to fail compilation as a WinEH funclet. Current Perry emits a supported landing-pad path, so successful compilation trips the stale refusal check before the probe can execute.

Run the original try/catch probe on Windows through the same pinned-Node comparison and forced-evacuation matrix as the other targets. Require positive evacuation diagnostics and a measured RS4GC report with positive records and roots. The compiler guard and existing regression for genuine WinEH funclet IR remain unchanged.

This isolates the workflow correction from #11680. Its Rust code and the owner-reserved #11734 integration are not included. All compiler/runtime sources are byte-identical to main b8a44f333e801d9e41a15cffe264d14280597c04.

Local source validation: YAML parses, the changed matrix shell has valid syntax, evacuation-liveness self-tests and gate-wiring checks pass, and report controls accept a measured positive report while rejecting empty functions, a wrong backend, zero records, zero roots and unmeasured compact maps. These are parser controls, not an executed Windows probe.

Draft pending final-head full local lint, compiler/funclet-guard validation, and actual current-head Windows probe execution. No hosted CI or native execution success is claimed.

Refs #11560.

Current-head Windows execution at 443f9d0b58d5428a7ea67ddf14ba7d6e64f52089: the whole native-root job succeeded. The try/catch probe matched pinned Node26.5.1 under RS4GC and forced evacuation, with 76 actual copying minors and 3,545 objects copied. The try-specific report gate also accepted only RS4GC with positive emitted stackmap records and roots. All executed job steps succeeded. This is actual Windows execution, not parser-only evidence. The PR remains draft while final-head full lint, the compiler funclet-guard unit, and remaining target CI are pending.

Current-head Linux target results: both Linux x64 and Linux ARM whole native-root jobs succeeded at this same head. Each try/catch probe performed 76 copying minors and moved 3,545 objects. Windows also succeeded as recorded above. macOS is still running; final full lint and the dedicated compiler funclet-guard unit remain pending.

The current-head macOS job has now completed. Its probe matrix, walker agreement, both non-default walkers and in-process RS4GC steps passed. The whole job failed in the provider dylib fixture link with five CoreFoundation and three Objective-C undefined symbols; this is not a whole macOS pass. The stdlib-provider link omits the framework flags already used for the runtime dylib build. A separate fix is being validated; this draft remains pending final full lint, the real funclet-refusal unit and remaining CI acceptance.

[coderabbitai]

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[proggeramlug]

Superseded: #11680 (073b079) landed the identical gc-native-roots.yml change (all 59 changed lines match).