Address review feedback on #3224 (roboomp + Codex): #<number> now requires a token boundary before # (start/whitespace/quote/paren/</=), matching the internal-URL boundary set, so owner/repo#N, foo#N, C#12, and URL fragments no longer match and corrupt on accept. Also detect a pr/pull/issue qualifier word before the number (pr #3164 / issue #3164); when present, only that kind is offered and the qualifier is consumed on accept.
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
roboomp