Differential-testing detector now flags glued subshell groups too

Claude Code's detector for shell commands that might behave differently across bash and zsh has a new case: a (...) group that appears directly attached to the end of a preceding word or statement, on the same line. Bash rejects this kind of command outright, but zsh instead reads the glued parentheses as a glob-group word and expands whatever follows it. Previously, this specific pattern only triggered a generic 'statement follows statement' message.