fix(ci): bound Discord release summaries (#11695)

* fix(ci): bound Discord release summaries

The release model can return more than Discord's 2,000-character
message limit. Discord then rejects the entire release notification.

Ask the model for a smaller response and truncate extracted content to
1,800 characters before the notification step. The smaller bound leaves
room below Discord's hard limit when model output varies.

Assisted-by: Codex:gpt-5

* fix(tests): implement node liveness stub

NodeCommandSender now requires PingNode. The endpoint test stub must
implement it before the package can compile.

Assisted-by: Codex:gpt-5 [Codex]

---------

Co-authored-by: localai-org-maint-bot <306269227+localai-org-maint-bot@users.noreply.github.com>

.github/workflows/notify-releases.yaml

@@ -31,13 +31,14 @@ jobs:
             messages: [
                 {
                 role: "system",
-                content: "Write a discord message with a bullet point summary of the release notes."
+                content: "Write a Discord message with a bullet point summary of the release notes. Keep the complete message under 1800 characters."
                 },
                 {
                 role: "user",
                 content: $input
                 }
-            ]
+            ],
+            max_tokens: 450
             }')
 
             # Send the request to LocalAI API
@@ -46,7 +47,7 @@ jobs:
             -d "$json_payload")
 
             # Extract the summary from the response
-            summary=$(echo $response | jq -r '.choices[0].message.content')
+            summary=$(printf '%s' "$response" | jq -er '.choices[0].message.content | strings | .[0:1800]')
 
             # Print the summary
             #  -H "Authorization: Bearer $API_KEY" \

core/http/endpoints/localai/nodes_backends_list_test.go

@@ -42,6 +42,8 @@ func (s *stubNodeCommandSender) StopBackend(_, _ string) error { return nil }
 
 func (s *stubNodeCommandSender) UnloadModelOnNode(_, _ string) error { return nil }
 
+func (s *stubNodeCommandSender) PingNode(_ string) error { return nil }
+
 var _ = Describe("ListBackendsOnNodeEndpoint", func() {
 	var registry *nodes.NodeRegistry