Add netty worktree helpers

Add netty-specific worktree helper commands and a zsh wrapper that creates sibling worktrees and cds into them.

Also split script packaging so Darwin keeps the existing wt integration while netty gets git-worktree-based helpers.

Co-authored-by: Codex <noreply@openai.com>

scripts/wt-path.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [[ $# -ne 1 ]]; then
+  printf 'usage: wt-path <worktree-name>\n' >&2
+  exit 1
+fi
+
+repo_root=$(git rev-parse --show-toplevel 2>/dev/null) || {
+  printf 'wt-path: not inside a git repository\n' >&2
+  exit 1
+}
+
+worktree_name=$1
+clean_name=$(printf '%s' "$worktree_name" | sed -E 's#[^[:alnum:]._-]+#-#g; s#-+#-#g; s#(^[.-]+|[.-]+$)##g')
+
+if [[ -z "$clean_name" ]]; then
+  printf 'wt-path: %s does not produce a usable path name\n' "$worktree_name" >&2
+  exit 1
+fi
+
+repo_parent=$(dirname "$repo_root")
+repo_name=$(basename "$repo_root")
+
+printf '%s/%s-%s\n' "$repo_parent" "$repo_name" "$clean_name"