fix: use env command for array execution to support inline var assignments (#33)

The autofixer test suite uses act to run the action locally and replaces
npx --yes mobbdev@latest with API_URL=http://... node .../dist/index.mjs
via sed.

Bash arrays don't support inline VAR=value command syntax (the VAR=value
is treated as a command name, not an env var assignment). The env command
handles this correctly, passing the variable to the child process.

This works for both:
- Normal use: env npx --yes mobbdev@latest review ...
- Test override: env API_URL=http://... node .../index.mjs review ...

Author: jonathansantilli

action.yml

@@ -86,7 +86,7 @@ runs:
           fi
         fi
 
-        OUT=$("${MOBB_ARGS[@]}")
+        OUT=$(env "${MOBB_ARGS[@]}")
 
         RETVAL=$?
         if [ $RETVAL -ne 0 ]; then

review/action.yml

@@ -80,7 +80,7 @@ runs:
           MOBB_ARGS+=(--mobb-project-name "$MOBB_PROJECT_NAME")
         fi
 
-        OUT=$("${MOBB_ARGS[@]}" || true)
+        OUT=$(env "${MOBB_ARGS[@]}" || true)
         OUT=$(echo "$OUT" | tr '\n' ' ')
         MOBB_URL=$(echo "$OUT" | grep -oE 'https://[^ ]+' | head -1)