boot: argv naming nothing opens an errors pane, not a stack trace

`pardes nosuchfile` returned error.BadArgs out of nativeMain, which std prints
as `error: BadArgs` with a return trace under it — indistinguishable from a
crash, for a typo, and it left the human with no editor at all. A launch that
names something look.resolve cannot make a target of now boots one +Errors pane
filling the window, saying `file or directory not found` and the argument AS
TYPED: acme's own vocabulary for output that came from the program rather than
from a word somebody clicked, and the word rather than a resolved path because
`pardes ~/notes/tdoo.md` wants to see its own typo back.

A chdir that fails on a directory that really is one stays BadArgs. That is a
permission problem rather than a typo, and the two want different answers.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_016Q4RATpafkwahrovHQLKRf

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