Add deploy-cli.sh: ship the CLI as a single bundled file, no git clone needed

The CLI only touches Node builtins and libsodium-wrappers (no native
addons like better-sqlite3, which the server needs but the CLI never
imports) -- confirmed by checking its actual import graph, not assumed.
That makes it a good candidate for a single-file esbuild bundle rather
than requiring a full git checkout + npm install on every machine that
needs to run `keep pull`.

deploy-cli.sh bundles src/cli (~18kb) and ships it straight to a host
over SSH -- HOST=user@vps ./deploy-cli.sh -- mirroring flit's
deploy-daemon.sh ssh-cat-chmod pattern rather than inventing a new
convention. No git, no npm install, no node_modules on the target at
all, just the one file plus a `node` runtime already there from
whatever else is deployed on that box.

Caught a real bug while building this: --banner:js="#!/usr/bin/env
node" duplicated the shebang esbuild already preserves from the source
file automatically, landing it on line 2 instead of line 1 -- Node
only special-cases a shebang on line 1, so the bundle threw a syntax
error on every invocation until the redundant banner flag was removed.

Verified the bundle for real, not just that it builds: ran `keep
identity init` / `identity show` against it directly and confirmed a
real Ed25519 keypair comes out the other end -- the specific thing
worth checking given libsodium-wrappers needed a createRequire
workaround for its own broken ESM packaging, and bundling could easily
have broken that differently.

Also documents both CLI-provisioning paths in INTEGRATION.md
(scripts/install-cli.sh for a machine you're fine cloning onto,
deploy-cli.sh for one you'd rather not) as a "getting keep onto a
machine" prerequisite section, ahead of the existing deploy-pattern
docs that all assume it's already there.

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

deploy-cli.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# deploy-cli.sh — bundle the keep CLI into a single portable file and ship
+# it straight to a host over SSH. No git clone, no npm install on the
+# target — the bundle only touches Node builtins and libsodium-wrappers
+# (pure JS/WASM, no native compilation), so the file itself is the whole
+# artifact. Mirrors flit/deploy-daemon.sh's ssh-cat-chmod pattern.
+#
+# Usage: HOST=user@host ./deploy-cli.sh
+set -euo pipefail
+
+HOST="${HOST:?usage: HOST=user@host ./deploy-cli.sh}"
+BIN_DIR="${BIN_DIR:-~/bin}"
+
+echo "→ bundling keep CLI…"
+npm run build:cli-bundle
+
+echo "→ uploading to $HOST:$BIN_DIR/keep…"
+ssh "$HOST" "mkdir -p $BIN_DIR && cat > $BIN_DIR/keep && chmod +x $BIN_DIR/keep" < dist-bundle/keep
+
+echo "→ verifying…"
+ssh "$HOST" "$BIN_DIR/keep --help" | head -1
+
+echo "✓ done — re-run this script any time the CLI changes; it's one file, safe to overwrite."