test(tests/examples/multiline.txt): 🚨 trim sample file to 10 lines to match new behavior test(tests/integration_tests.rs): 🚨 adjust line ranges and expected outputs for 10-line sample; add multi-range context test
test(tests/examples/multiline.txt): 🚨 add lines 5-20 to sample file for expanded line-range tests test(tests/integration_tests.rs): 🚨 update expected outputs and add comprehensive context and error tests for line-range feature