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Add hermit-managed shim scripts for uv/uvx/npx/node that provide config-isolated toolchain execution for MCP servers, preventing ambient system toolchains from leaking user config into agent processes. Security hardening: - Private mktemp temp dir with cleanup trap (no predictable paths) - Lock mutual exclusion via kill-0 + /proc start-time verification - Atomic bootstrap recovery (staged download + validated mv) - Desktop fail-loud validation of shim resources before env export Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>