feat: add Codex CLI installer (symlinks into ~/.agents/skills)

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

install-codex.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+# Install the gw-triage skills for OpenAI Codex CLI by symlinking them
+# into ~/.agents/skills. Safe to re-run; updates arrive via `git pull`
+# in this clone (symlinks keep pointing at the updated files).
+set -eu
+
+repo_dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd -P)
+dest="${HOME}/.agents/skills"
+
+mkdir -p "$dest"
+for skill in triage setup map-repo; do
+  ln -sfn "$repo_dir/skills/$skill" "$dest/$skill"
+  echo "linked $dest/$skill -> $repo_dir/skills/$skill"
+done
+
+echo "Fatto. Per aggiornare in futuro: git -C \"$repo_dir\" pull"