Atoms in `args["--"]` are raw passthrough per yargs `populate--`
semantics: the user typed `--` to opt out of further parsing, so
the assembler must not synthesize quote bytes around them. Re-quoting
raw atoms breaks leading-dash inputs like
kilo run -- "- Who are you?"
by emitting `"- Who are you?"` (literal quotes) into the model prompt.
Atoms before `--` keep the existing wrap-quote behavior from #4979 so
shell-bound multi-word positionals still preserve their boundaries.
Extracted the message assembler to `cli/cmd/run-message.ts` so it can
be unit-tested without pulling in the full handler's dependency tree.
truffle
90ba442177