form-compile: warn about unknown DSL keys in element definitions,
document stdCommand/command button keys and EPF-specific notes.
form-validate: check that form-level Title uses multilingual XML,
not plain text (which causes XDTO errors at build time).
form-add: warn about duplicate element names, clarify after-not-found
message when using into+after together.
form-info: show Title in header instead of Properties line, display
commands as DSL-friendly format (-> Name [cmd], -> Close [std])
instead of raw Form.Command/Form.StandardCommand paths.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>