feat: allow package names in interactive info commands

docs/DESIGN.md

@@ -126,6 +126,11 @@ Refreshing package lists... done.
 
 Command grammar (one line, whitespace-separated tokens, each `N` is the number in brackets):
 Unknown tokens reject the line; nonexistent numbers report an error and are skipped.
+For `?` and `??`, the exact name of a listed package may replace `N`; a digits-only
+reference is treated as a number. Missing or no longer listed names are reported and
+skipped. Other commands accept only numbers: package names can contain `-` or end in
+`x`, and limiting name references to information commands avoids unnecessary parsing
+complexity.
 Consecutive `N+` commands and `*+` trust the selected dependency roots, recording
 other selected packages in their closures as dependencies regardless of input order.