Strip Linux hosts from release bundles

[lukewilliamboswell]

Summary

• strip debug data and relocation-unneeded symbols from x64musl and arm64musl libhost.a files
• install llvm-tools-preview in CI and release jobs that build Linux hosts
• fail bundling before publication if unpacked platform inputs exceed the Roc default 100 MiB dependency limit

macOS and Windows archives are unchanged. Only the oversized Linux hosts need trimming, and avoiding Mach-O rewriting preserves Roc linker compatibility.

Size impact

• x64musl libhost.a: 27.0 MB to 9.1 MB
• arm64musl libhost.a: 28.3 MB to 9.1 MB
• projected complete platform: 101.4 MiB to approximately 65.9 MiB

Validation

• rebuilt and linked every example for x64musl using the stripped archive
• Python syntax checks passed
• workflow YAML parsing passed
• git diff --check passed