Add a real global keep CLI instead of npm run cli --

npm run cli -- <args> only works from inside this repo's directory,
which is awkward everywhere but especially on a deploy host running
this alongside a dozen other projects. scripts/install-cli.sh builds
the CLI and symlinks dist/cli/index.js onto PATH (~/.local/bin by
default, no root/global npm install needed) as a real `keep` command,
runnable from anywhere.

Symlinked rather than copied, so a future `git pull && npm run build`
is the entire upgrade story -- no need to re-run the install script
after the first time.

Verified: keep --help and keep identity show both work correctly from
unrelated directories (/tmp, $HOME) after running the install script,
confirming no hidden cwd dependency.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

scripts/install-cli.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+# Builds keep and symlinks the CLI onto PATH as a real `keep` command --
+# no `npm run cli --` from inside this repo, no npm global install (which
+# needs root/write access to the system Node install on most hosts).
+#
+# Since this is a symlink to dist/cli/index.js rather than a copy, a
+# future `git pull && npm run build` here is the entire upgrade story --
+# no need to re-run this script.
+set -eu
+cd "$(dirname "$0")/.."
+
+BIN_DIR="${KEEP_BIN_DIR:-$HOME/.local/bin}"
+mkdir -p "$BIN_DIR"
+
+npm run build
+chmod +x dist/cli/index.js
+ln -sf "$(pwd)/dist/cli/index.js" "$BIN_DIR/keep"
+
+echo "keep CLI linked: $BIN_DIR/keep -> $(pwd)/dist/cli/index.js"
+case ":$PATH:" in
+  *":$BIN_DIR:"*) echo "$BIN_DIR is already on PATH — try: keep --help" ;;
+  *) echo "warning: $BIN_DIR is not on PATH — add it to your shell profile" ;;
+esac