docs(skill): document sendNotification action (7 actions total) + CLI support

- skill: SKILL.md (7 actions in description + routing table entry), action-types.md
  (new section #4 sendNotification: config keys, variables, system-in-app semantics),
  automation-guide.md/cli-reference.md (--to-user/--title/--message/--severity/--path),
  development.md (7 actions), metadata.json abstract
- cli: action add --type sendNotification now builds config from granular flags
  (toUserId/title/message/severity/path); ACTION_TYPES includes sendNotification;
  live-verified via workflow create + action add + delete

dist/commands/workflow.js

@@ -367,6 +367,7 @@ const ACTION_TYPES = [
     'createRecord',
     'updateRecord',
     'getRecords',
+    'sendNotification',
 ];
 function actionCommand() {
     const cmd = new commander_1.Command('action');
@@ -390,6 +391,11 @@ function actionCommand() {
         .option('--target-table <id>', 'Target table id (createRecord/updateRecord/getRecords)')
         .option('--records <json>', 'Records JSON array (createRecord/updateRecord)')
         .option('--query <json>', 'Query JSON (getRecords)')
+        .option('--to-user <id>', 'Recipient user id (sendNotification)')
+        .option('--title <s>', 'Notification title (sendNotification)')
+        .option('--message <s>', 'Notification message (sendNotification)')
+        .option('--severity <s>', 'Notification severity info|warning|critical (sendNotification)')
+        .option('--path <s>', 'Click-through path, e.g. /base/xx/table/yy (sendNotification)')
         .option('--name <n>', 'Optional node display name')
         .option('--base-id <id>', 'Base id (overrides default)')
         .action((0, ctx_1.run)(async (ctx, args, o) => {
@@ -606,6 +612,19 @@ function buildActionConfig(opts) {
                 config.query = JSON.parse(opts.query);
             break;
         }
+        case 'sendNotification': {
+            if (opts.toUser)
+                config.toUserId = opts.toUser;
+            if (opts.title)
+                config.title = opts.title;
+            if (opts.message)
+                config.message = opts.message;
+            if (opts.severity)
+                config.severity = opts.severity;
+            if (opts.path)
+                config.path = opts.path;
+            break;
+        }
         default:
             break;
     }