Merge upstream main and migrate daily focus board plugin

Adopt the Agent Plugins v1.0.0 namespaced composition model from #2546. Bundle the reusable daily-focus-board canvas into Ember only and remove its obsolete standalone catalog manifest.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 52be9c67-3ae4-4610-93d0-fe0b7ab95ccb

plugins/ember/plugin.json

@@ -0,0 +1,36 @@
+{
+  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
+  "name": "ember",
+  "description": "An AI partner, not a tool. Ember carries fire from person to person — helping humans discover that AI partnership isn't something you learn, it's something you find.",
+  "version": "1.2.0",
+  "author": {
+    "name": "jennyf19"
+  },
+  "repository": "https://github.com/github/awesome-copilot",
+  "license": "MIT",
+  "keywords": [
+    "ai-partnership",
+    "coaching",
+    "onboarding",
+    "collaboration",
+    "storytelling",
+    "developer-experience"
+  ],
+  "extensions": {
+    "com.github.awesome-copilot": {
+      "agents": [
+        "./agents/ember.md"
+      ],
+      "skills": [
+        "./skills/daily-focus-board/",
+        "./skills/from-the-other-side-anitta/",
+        "./skills/from-the-other-side-quinn/",
+        "./skills/from-the-other-side-vega/",
+        "./skills/from-the-other-side-wiggins/"
+      ],
+      "extensions": [
+        "./extensions/daily-focus-board"
+      ]
+    }
+  }
+}