Fold link listing + fzf-pick into tsk follow
The previously-separate `tsk links` command duplicated tsk follow's
resolve+open logic. Drop it; instead extend follow:
tsk follow -T <id> list links and exit
tsk follow -T <id> -l N open link N (existing behavior)
tsk follow -T <id> -s fzf-pick a link, then open it
URLs go to the system handler, [[tsk-N]] internal links are shown,
foreign refs resolve through the configured remote — same paths as
before, just exposed as different invocations of one command.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>