chore: import upstream snapshot with attribution

docs/articles/install.md

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+## Install The Compiler
+
+Install Zerolang when you want an agent to build graph-first programs on your
+machine. The compiler is experimental. Use it in isolated workspaces and avoid
+production data.
+
+## Install The Latest Release
+
+```sh
+curl -fsSL https://zerolang.ai/install.sh | bash
+export PATH="$HOME/.zero/bin:$PATH"
+zero --version
+```
+
+The installer downloads the latest release asset for your platform and checks
+the release checksum file before installing the binary.
+
+## Verify The Environment
+
+```sh
+zero doctor
+zero targets
+zero skills
+```
+
+`zero doctor --json` includes host and toolchain readiness. `zero targets --json`
+includes `targetToolchains`, target aliases, hosted capability facts, and
+cross-target support notes.
+
+## Load Version-Matched Agent Knowledge
+
+Agents should not rely on a stale external Zero guide. Ask the installed
+compiler for the skills bundled with that exact binary:
+
+```sh
+zero skills
+zero skills get agent
+zero skills get graph
+zero skills get language
+zero skills get stdlib
+```
+
+The thin external Zero skill is only a bootstrap stub. The compiler-bundled
+skills are the current command and language reference for that release.
+
+## Repository Checkout
+
+When working inside the Zero compiler repository, build the local compiler and
+then use the checkout's `zero` binary for experiments:
+
+```sh
+pnpm install
+make -C native/zero-c
+zero --version
+```
+
+The repository contributor notes cover checkout-specific wrapper commands.