feat(install): add remote-install.sh curl|bash bootstrap

One-liner installer: ensure git is present (apt-get install if
missing), clone the repo to ~/config (or pull if it exists), then
run install.sh. REPO_URL/CLONE_DIR/BRANCH overridable via env.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

remote-install.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# remote-install.sh — one-liner bootstrap: clone this repo, then run install.sh.
+# Usage:
+#   curl -fsSL https://git.bchanot.fr/bchanot/config/raw/branch/master/remote-install.sh | bash
+# Override defaults with env vars:
+#   REPO_URL=...  CLONE_DIR=...  BRANCH=...  curl ... | bash
+set -euo pipefail
+
+REPO_URL="${REPO_URL:-https://git.bchanot.fr/bchanot/config.git}"
+CLONE_DIR="${CLONE_DIR:-$HOME/config}"
+BRANCH="${BRANCH:-master}"
+
+# git is required to fetch the repo. Install it on Debian/Ubuntu, else bail with a hint.
+if ! command -v git >/dev/null 2>&1; then
+	if command -v apt-get >/dev/null 2>&1; then
+		echo "git not found — installing via apt-get"
+		sudo apt-get update
+		sudo apt-get install -y git
+	else
+		echo "git not found and no apt-get available. Install git first, then re-run." >&2
+		exit 1
+	fi
+fi
+
+# Clone fresh, or update an existing checkout (idempotent re-runs).
+if [ -d "$CLONE_DIR/.git" ]; then
+	echo "Updating existing checkout at $CLONE_DIR"
+	git -C "$CLONE_DIR" fetch --quiet origin "$BRANCH"
+	git -C "$CLONE_DIR" checkout --quiet "$BRANCH"
+	git -C "$CLONE_DIR" pull --quiet --ff-only origin "$BRANCH"
+elif [ -e "$CLONE_DIR" ]; then
+	echo "$CLONE_DIR exists but is not a git repo. Move it aside or set CLONE_DIR=..." >&2
+	exit 1
+else
+	echo "Cloning $REPO_URL into $CLONE_DIR"
+	git clone --quiet --branch "$BRANCH" "$REPO_URL" "$CLONE_DIR"
+fi
+
+# Hand off to the OS-detecting installer.
+echo "Running install.sh"
+bash "$CLONE_DIR/install.sh"