Shorter reasons when a shell command needs your approval

When Claude Code asks you to approve a shell command, it gives a reason. Several of these reasons are now shorter and worded differently:

• "it unsets PATH" and "it runs a file by a relative path" no longer carry an explanation in brackets.
• One reason now reads "it unsets a GIT_CONFIG variable".
• Other wordings changed too, such as "this machine cannot verify".