fix(n8n): harden evening digest workflow

Allow optional n8n execution, Obsidian note listing, and Obsidian save steps to continue on failure so the digest can still send when one local source is unavailable.

swarm-common/n8n-workflows/PlZywwqL8MRNEAN6.json

@@ -1,5 +1,5 @@
 {
-  "updatedAt": "2026-05-14T00:04:59.343Z",
+  "updatedAt": "2026-06-05T19:59:54.879Z",
   "createdAt": "2026-05-13T21:40:33.847Z",
   "id": "PlZywwqL8MRNEAN6",
   "name": "Evening Digest",
@@ -56,7 +56,9 @@
           "id": "UPAHgUJVRqZQceL4",
           "name": "n8n Public API (Failure Digest)"
         }
-      }
+      },
+      "continueOnFail": true,
+      "alwaysOutputData": true
     },
     {
       "parameters": {
@@ -86,7 +88,9 @@
           "id": "UPAHgUJVRqZQceL4",
           "name": "n8n Public API (Failure Digest)"
         }
-      }
+      },
+      "continueOnFail": true,
+      "alwaysOutputData": true
     },
     {
       "parameters": {
@@ -138,7 +142,9 @@
           "id": "465Swz2b71O2KRAK",
           "name": "Obsidian Local REST API"
         }
-      }
+      },
+      "continueOnFail": true,
+      "alwaysOutputData": true
     },
     {
       "parameters": {
@@ -275,7 +281,9 @@
           "id": "465Swz2b71O2KRAK",
           "name": "Obsidian Local REST API"
         }
-      }
+      },
+      "continueOnFail": true,
+      "alwaysOutputData": true
     }
   ],
   "connections": {