#176 DSL Test 1: Simple Shell Commands Workflow

PROMPT: Create a workflow that runs 3 shell commands in sequence: 1) echo 'Starting', 2) list files in /tmp, 3) echo 'Done'. Store each result for the next task to reference. EXPECTED: Sequential tasks using tools.shell.run with result_key and proper dependencies. VALIDATION: All 3 tasks execute in order, results captured.