--- phase: '01-test' plan: '01' type: execute wave: 1 depends_on: [] files_modified: - output.txt autonomous: true requirements: - TEST-01 must_haves: truths: - output.txt exists with expected content artifacts: - output.txt key_links: [] --- Create a simple output file to prove the SDK can execute a plan end-to-end. Create output file output.txt Create output.txt with content 'hello from gsd-sdk' test -f output.txt output.txt exists with expected content