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Neil
73e316a67f
Of the two ways node-pty fails, only one is catchable. A missing module throws MODULE_NOT_FOUND. A module built against the wrong libc or Node ABI is refused by the dynamic loader, and in the worst case takes the process down before any handler exists — that is #9902, which crashed the desktop app on Ubuntu 20.04 before a window appeared. There was no libc or ABI precondition anywhere in the tree. So orcad now proves the load in a CHILD process, from main.ts, before anything requires node-pty. Whatever the child does — throw, abort, die on a signal — is data rather than our own death, and the operator gets a sentence naming the host's libc, Node ABI and prebuild slot plus the command to run. Proven-unloadable exits 78 (EX_CONFIG), so a supervisor does not restart an unequippable host forever. A probe that never answered is unverifiable, not blocked: refusing to boot on an inconclusive signal would take down hosts that work. The child dlopens the file node-pty would have chosen, before requiring the package. node-pty's loader walks several directories and rethrows only the LAST error, so a refused binary reads as "Cannot find module ./prebuilds/..." — which sends the operator to install a module that is already there. It also reports through stdout: node echoes the whole -e source above a stack trace, and matching tokens against stderr made the probe's own source text answer for the verdict. Verdicts reach clients as a terminal_unavailable degradation alongside the existing browser_unavailable one, through the same cause-registry shape. degradations[].code is now an open vocabulary; clients already render only `message`. Prebuilds are compiled from PATCHED sources — the patch IS the glibc-floor fix, so an upstream tarball reproduces #9902 — into linux-{x64,arm64}-{glibc,musl} and darwin-{x64,arm64} slots. libc is in the slot name because node-pty's loader falls back to prebuilds/<platform>-<arch> and cannot tell glibc from musl. orcad installs the matching slot at boot, so a host with no compiler serves terminals. The relay's five pure toolchain-diagnosis functions moved to a transport-free module so the Node bundle can reuse them without dragging ssh2 in behind them; the relay keeps its API by re-export. macOS gets `xcode-select --install` rather than the cross-distro apt/dnf/pacman/apk menu, every line of which is wrong there.