Typing #<number> (e.g. #3164) in the prompt now offers PR and Issue autocomplete candidates; accepting one rewrites the token to the pr:///issue:// internal URL (+ trailing space, matching the @/internal-url convention). The existing read tool -> InternalUrlRouter -> gh pipeline resolves it from the cwd's git remote, so no new resolution code is needed.
Bare # and #<text> keep the existing prompt-action menu (additive, no regression). #<number> requires a positive integer, so #0 / leading zeros do not offer candidates.
Closes#3218
oldschoola