DOC: add copilot-instructions.md for coding-agent guidance - #406

Unexpected input(s) 'ignore_globs', 'ignore_rules_list', valid inputs are ['entryPoint', 'args', 'directory-to-scan', 'should-scan-archives', 'output-filename', 'output-directory', 'ignore-globs', 'exclude-rules', 'options-json', 'extra-options']