inspect_plist rooted every file target at the file's own directory, so a
program file under App.app/Contents/MacOS defaulted to
Contents/MacOS/Contents/Info.plist and --relative-path resolved from MacOS/
instead of the app root the CLI documents. A selected plist file likewise
looked for <dir>/Contents/Info.plist instead of reading itself.
A program file directly under a bundle's Contents/MacOS now roots at that
bundle, and a plist artifact target is its own default plist. The missing
default message names the default plist rather than Contents/Info.plist.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>