* fix(crabbox): preserve UTF-16 boundaries in CLI failure detail truncation
commandDetail replaced raw .slice(0, MAX_ERROR_DETAIL_CHARS) with
truncateUtf16Safe on the whitespace-compressed error detail output.
A 511-code-unit prefix with an emoji at the boundary produces a lone
high surrogate (U+D83D) on current main; the shared surrogate-aware
helper backs the cut up to preserve well-formed UTF-16.
* fix(crabbox): add provider-path UTF-16 regression test for inspect boundary
The existing test exercised commandDetail directly; ClawSweeper's P1
requires proof through the real provider boundary. The new test calls
provider.inspect() with a CLI runner that returns 511 ASCII + emoji in
stderr, proving commandDetail → truncateUtf16Safe works through the
full inspect → commandError → commandDetail chain.
Co-Authored-By: Claude <noreply@anthropic.com>
* refactor(crabbox): keep error proof on provider path
---------
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
