Greptile Summary

This PR fixes the Ruby backend's lock identity to include all inputs that can change the compiled or downloaded artifact: compile mode, installer choice (ruby-build vs ruby-install), their repo URLs and extra options, patch inputs, and precompiled URL/platform selectors. Six new unit tests — guarded by a Mutex to serialise global Settings mutations — cover the precompiled, source-build, fallback, experimental-default, and ruby-install paths.

• resolve_lockfile_options is rewritten to emit compile, ruby_install, repo, opts, and patch keys when running on the current platform, and to emit precompiled URL/arch/os keys when try_precompiled is true.
• try_precompiled in resolve_lockfile_options duplicates the logic from should_try_precompiled() verbatim; the latter has a versioned debug_assert! reminder to update it at 2026.8.0, but the inline copy will not get that reminder.

Confidence Score: 4/5

Safe to merge; the lock identity expansion is correct and well-tested, with one minor duplication that could drift when the precompiled-default TODO is resolved.

The logic change is straightforward and backed by six targeted tests. The only concern is that try_precompiled is inlined rather than delegated to should_try_precompiled(), which carries a versioned reminder comment. If that method is updated at 2026.8.0 and the inline copy is missed, lock entries will diverge from installation behaviour.

src/plugins/core/ruby.rs — the try_precompiled duplication on lines 1028-1029 relative to should_try_precompiled() at line 441.

Important Files Changed

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