Db library scripts are basically a JS module scoped to the db, and
handlers already get fetch — but runLibrary's own vm context only
bound sql/console, so any library calling fetch (e.g. the chat db's
OpenAI call) threw ReferenceError. Since library calls are often
fire-and-forget inside setTimeout (no rejection handler), that
crashed the whole process. Bind fetch in all three places a library
script runs: request-time (runLibrary), the library-editor save eval,
and repl.
Also add `bliss link` to bliss-cli for jumping straight to a
structure/route/template/db's workshop editor URL, including
resolving a db by its require('db')(alias) name.
