[Fix #1180] Partially revert run task changes from #1129

Revert script arguments from array (string[]) back to object (map)
to restore compatibility with the Java SDK reference implementation.
Remove stdin from script process since embedded script engines
(GraalJS, Jython) have no real stdin pipe — users who need stdin
with scripts should use run:shell instead. Shell arguments remain
as string[] since positional argv is the convention for shell commands.

- Schema: revert arguments type for script to map, remove script stdin
- Restore run-script-with-arguments.yaml example (map-based)
- Delete run-script-with-stdin-and-arguments.yaml (argv-based)
- Add run-shell-external-script.yaml showing the pattern for running
  an external script via shell with stdin and arguments
- Update dsl-reference.md to match schema changes

Signed-off-by: Ricardo Zanini <ricardozanini@gmail.com>

Author: ricardozanini

dsl-reference.md

@@ -981,8 +981,7 @@ Enables the execution of custom scripts or code within a workflow, empowering wo
 | language | `string` | `yes` | The language of the script to run.<br>*Supported values are: [`js`](https://tc39.es/ecma262/2024/) and [`python`](https://www.python.org/downloads/release/python-3131/).* |
 | code | `string` | `no` | The script's code.<br>*Required if `source` has not been set.* |
 | source | [externalResource](#external-resource) | `no` | The script's resource.<br>*Required if `code` has not been set.* |
-| stdin | `string` | `no` | A runtime expression, if any, to the script as standard input (stdin).|
-| arguments | `string[]` | `no` | A list of the arguments, if any, to the script as argv |
+| arguments | `map` | `no` | A key/value mapping of the arguments, if any, to use when running the configured script |
 | environment | `map` | `no` | A key/value mapping of the environment variables, if any, to use when running the configured script process |
 
 
@@ -999,21 +998,22 @@ Enables the execution of custom scripts or code within a workflow, empowering wo
 
 ```yaml
 document:
-  dsl: 1.0.3
+  dsl: '1.0.3'
   namespace: examples
-  name: run-script-example
+  name: run-script-with-arguments
   version: 1.0.0
 do:
-  - runScript:
+  - setInput:
+      set:
+        message: Hello World
+  - log:
       run:
         script:
           language: js
           arguments:
-          - hello
-          - world
-          code: |
-            const [_, __, arg0, arg1] = process.argv;
-            console.log('arg > ', arg0, arg1)
+            message: ${ .message }
+          code: >
+            console.log(message)
 ```
 
 ##### Shell Process
@@ -1026,7 +1026,7 @@ Enables the execution of shell commands within a workflow, enabling workflows to
 |:--|:---:|:---:|:---|
 | command | `string` | `yes` | The shell command to run |
 | stdin | `string` | `no` | A runtime expression, if any, to the shell command as standard input (stdin).|
-| arguments | `string[]` | `no` | A list of the arguments, if any, to the shell command as argv |
+| arguments | `string[]` | `no` | A list of the arguments, if any, of the shell command to run |
 | environment | `map` | `no` | A key/value mapping of the environment variables, if any, to use when running the configured process |
 
 ###### Examples

examples/run-script-with-arguments.yaml

@@ -0,0 +1,17 @@
+document:
+  dsl: '1.0.3'
+  namespace: examples
+  name: run-script-with-arguments
+  version: 1.0.0
+do:
+  - setInput:
+      set:
+        message: Hello World
+  - log:
+      run:
+        script:
+          language: js
+          arguments:
+            message: ${ .message }
+          code: >
+            console.log(message)

examples/run-script-with-stdin-and-arguments.yaml

@@ -0,0 +1,21 @@
+document:
+  dsl: '1.0.3'
+  namespace: examples
+  name: run-shell-external-script
+  version: 1.0.0
+do:
+  - setInput:
+      set:
+        name: World
+  - greet:
+      input:
+        from: ${ .name }
+      run:
+        shell:
+          command: python3 /path/to/greet.py
+          stdin: ${ . }
+          arguments:
+          - --greeting
+          - Hello
+          environment:
+            LOG_LEVEL: info

examples/run-shell-external-script.yaml

@@ -877,16 +877,11 @@ $defs:
                       type: string
                       title: ScriptLanguage
                       description: The language of the script to run.
-                    stdin:
-                      type: string
-                      title: ScriptStdin
-                      description: A runtime expression, if any, to the script as standard input (stdin).
                     arguments:
-                      type: array
+                      type: object
                       title: ScriptArguments
-                      description: A list of the arguments, if any, to the script as argv
-                      items:
-                        type: string
+                      description: A key/value mapping of the arguments, if any, to use when running the configured script.
+                      additionalProperties: true
                     environment:
                       type: object
                       title: ScriptEnvironment
@@ -931,7 +926,7 @@ $defs:
                     arguments:
                       type: array
                       title: ShellArguments
-                      description: A list of the arguments, if any, to the shell command as argv
+                      description: A list of the arguments, if any, of the shell command to run.
                       items:
                         type: string
                     environment: