docs: development.md prerequisites omit the C toolchain requirement (node-pty is a boot-time hard dependency)

[coderdailyone]

What happened: On a Linux host without make/gcc (and without root to install build-essential), pnpm install fails at node-pty@1.1.0's node-gyp build (gyp ERR! stack Error: not found: make). The upstream tarball ships prebuilds only for win32, so Linux/macOS always compile.

Setting allowBuilds: node-pty: false locally lets install finish, but the harness then fails loud at boot: dsh-subprocess-local imports node-pty at module top level, so every profile (including headless) refuses to start without the native binary — which is consistent with the misconfiguration-fails-loud stance, but means the toolchain is a hard prerequisite, not an optional extra for terminal features.

The gap: docs/development.md prerequisites list Node, pnpm/Corepack, and Git, but not a C toolchain. A fresh contributor on a minimal host discovers the requirement only at the bottom of a failed install.

Suggestions (either or both):

1. Add one line to the prerequisites: a C toolchain (build-essential / Xcode CLT) is required on Linux/macOS for node-pty's native build.
2. Possibly worth evaluating: @lydell/node-pty publishes prebuilt binaries and tracks upstream versions exactly (its 1.1.0 matches your pin; I verified the linux-x64 pty.node drop-in loads and spawns correctly through dsh-subprocess-local, and the full web profile boots and serves with it). Given the repo already patches node-pty, shipping or documenting a prebuild path could remove the toolchain requirement for users who only consume dsh.

Environment: Ubuntu 22.04, Node v24.18.0, pnpm 11.7.0, commit 47f9438. Happy to provide full logs.