docs(agentydragon): add worktree helper script and branch convention to README

agentydragon/tasks/create-task-worktree.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+#
+# create-task-worktree.sh
+#
+# Create or reuse a git worktree for a specific task branch under agentydragon/tasks/.worktrees.
+# Usage: create-task-worktree.sh <task-id>-<task-slug>
+
+set -euo pipefail
+
+if [ "$#" -ne 1 ]; then
+  echo "Usage: $0 <task-id>-<task-slug>"
+  exit 1
+fi
+
+task_slug="$1"
+branch="agentydragon/$task_slug"
+
+# Determine repository root
+repo_root=$(git rev-parse --show-toplevel)
+
+tasks_dir="$repo_root/agentydragon/tasks"
+worktrees_dir="$tasks_dir/.worktrees"
+worktree_path="$worktrees_dir/$task_slug"
+
+mkdir -p "$worktrees_dir"
+
+# Create branch if it does not exist
+if ! git show-ref --verify --quiet "refs/heads/$branch"; then
+  echo "Creating branch $branch from master..."
+  git branch --track "$branch" master
+fi
+
+# Create worktree if it does not exist
+if [ ! -d "$worktree_path" ]; then
+  echo "Creating worktree for $branch at $worktree_path"
+  git worktree add "$worktree_path" "$branch"
+else
+  echo "Worktree for $branch already exists at $worktree_path"
+fi
+
+echo "Done."