feat(install): support macOS and install skills in the curl installer

[JackNDwyer]

What

• install-cli.sh (what get.livekit.io/cli serves) now installs on macOS as well as Linux, using the existing darwin release archives for Intel and Apple silicon.
• It no longer needs jq or sha256sum, which macOS before 15 doesn't ship: the version comes from where /releases/latest redirects, and the checksum falls back to shasum -a 256.
• On macOS it creates /usr/local/bin if a fresh Mac doesn't have it. LK_INSTALL_PATH installs somewhere else, such as a user-level folder that needs no sudo.
• After installing, it runs lk skills install --global --yes, which installs LiveKit's skills and the Docs MCP server for the coding agents it finds. It runs when stdout is a terminal (under curl | bash, stdin is the script) or with LK_INSTALL_SKILLS=1, and is skipped in CI, as root, or with LK_INSTALL_SKILLS=0. A failure there is a warning, not a failed install.
• It warns when another lk, usually Homebrew's, comes first on PATH, or when the install folder isn't on PATH.
• Windows stays on winget; the script now says so instead of a generic error.

Why

This is the second half of DEVX-843: one command that installs the CLI, the Docs MCP server and the skills, so coding agents can build LiveKit agents from the start (DEVX-840). Mac users had only Homebrew, which can't run that step. The first half, a one-time offer in lk itself, is #1056.

get.livekit.io/cli redirects to this file on main, so merging ships it immediately; there's no release step.

How to verify

Without touching /usr/local/bin, run the branch's script into a temporary folder, with a test home that has a Claude Code folder:

T=$(mktemp -d); mkdir -p $T/home/.claude
curl -sSL https://raw.githubusercontent.com/livekit/livekit-cli/jackdwyer/devx-843-curl-installer/install-cli.sh \
  | HOME=$T/home LK_INSTALL_PATH=$T/bin bash

Expect the darwin (or linux) archive to download and pass the checksum, $T/bin/lk --version to print the latest version, and seven skills in $T/home/.claude/skills with the Docs MCP server added. With LK_INSTALL_SKILLS=0 or CI=1, no skills are installed.

What I tested on macOS 26 (Apple silicon): the full install with skills, the skip paths (no terminal, LK_INSTALL_SKILLS=0, CI=1), no coding agents (warning, exit 0), and the Homebrew PATH warning. With a stubbed uname, Linux x86_64, Linux aarch64 and Intel macOS each downloaded the right archive, passed the checksum and installed the right binary. Not tested: the default /usr/local/bin install with sudo, a real Linux machine, and shellcheck (Docker wasn't running locally; bash -n passes).

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