Mac mini disk/CPU is saturated with 10+ concurrent PR builds. Temporarily switching to GitHub-hosted macos-15 runners until we have more disk space. Self-hosted was faster due to incremental Rust builds but was causing CI queue buildup and false test failures. Changes: - CI: self-hosted → macos-15 - Release build: self-hosted → macos-15 - Remove per-runner pnpm store isolation (not needed on GitHub runners) - Add Rust cache for GitHub runners (keyed by Cargo.lock) - Remove CARGO_INCREMENTAL=1 (managed via cache instead)
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4.9 KiB