Add Ink skills and symlink installer

test/install-smoke.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+set -eu
+
+repo=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd -P)
+tmp=${TMPDIR:-/tmp}/ink-skills-smoke-$$
+trap 'rm -rf "$tmp"' EXIT HUP INT TERM
+mkdir -p "$tmp/home" "$tmp/project"
+
+list=$($repo/bin/ink-skills list)
+printf '%s\n' "$list" | grep '^SKILL' >/dev/null
+printf '%s\n' "$list" | grep '^ink-cli' >/dev/null
+printf '%s\n' "$list" | grep '^configure-ink-agent' >/dev/null
+
+HOME=$tmp/home $repo/bin/ink-skills install ink-cli >"$tmp/install.tsv"
+grep "ink-cli.*linked" "$tmp/install.tsv" >/dev/null
+[ -L "$tmp/home/.ink/skills/ink-cli" ]
+[ "$(readlink "$tmp/home/.ink/skills/ink-cli")" = "$repo/skills/ink-cli" ]
+
+HOME=$tmp/home $repo/bin/ink-skills install ink-cli >"$tmp/reinstall.tsv"
+grep "ink-cli.*unchanged" "$tmp/reinstall.tsv" >/dev/null
+
+mkdir -p "$tmp/home/.ink/skills/configure-ink-agent"
+if HOME=$tmp/home $repo/bin/ink-skills install configure-ink-agent >/dev/null 2>"$tmp/collision.err"; then
+    echo 'expected collision refusal' >&2
+    exit 1
+fi
+grep 'refusing existing path' "$tmp/collision.err" >/dev/null
+
+HOME=$tmp/home $repo/bin/ink-skills install --project "$tmp/project" create-ink-agent-cli-tool >"$tmp/project.tsv"
+[ -L "$tmp/project/.ink/skills/create-ink-agent-cli-tool" ]
+grep "create-ink-agent-cli-tool.*linked" "$tmp/project.tsv" >/dev/null
+
+printf 'ok\n'