Follow-up to #79. Known names and the hosts ssh names are now located as
spans in the text as it came, overlapping spans merged, and replaced in one
pass. A display name containing a scrubber token ("<host> Jane Doe headset")
now goes whole, and a name like "to host" can no longer hide ssh's
"connect to host X" operand. Tokens on their own are still left as they are.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>