Fixes for rustc 1.92

[mkeeter]

Workaround for rust-lang/rust-clippy#16467 and rust-lang/rust-clippy#16182

Tweaks to x86 JIT, due to weird failures (Windows only after the rustc update). I think writing the simplify flag with

mov r8w, 1
mov [rdx], r8w

caused a 2-byte write to a 1-byte field, and we were just getting lucky earlier.

[Copilot]

Pull request overview

This PR contains fixes for compatibility with rustc 1.92, addressing both clippy false positives and a subtle bug in x86_64 JIT assembly code.

Changes:

• Fixed x86_64 JIT assembly to use byte-sized memory operations instead of incorrectly writing 16-bit values to 8-bit fields
• Updated AVX cleanup code to use vzeroupper instead of the incorrect combination of emms and vzeroall
• Added clippy suppression attributes to work around known false positives in rustc 1.92

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
fidget-jit/src/x86_64/interval.rs	Fixed memory write bugs by changing from 16-bit register operations (ax, r8w) with i16 casts to direct byte-sized memory operations with i8 casts for both choice flags and simplify flag
fidget-jit/src/lib.rs	Replaced emms + vzeroall with proper vzeroupper instruction for AVX state cleanup on function exit
fidget-core/src/render/mod.rs	Added clippy suppressions for panicking_unwrap and unnecessary_unwrap false positives in rustc 1.92 (issues #16467 and #16182)

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