docs(releases): the release-notes door — owner-language notes for both engines, backfilled

The fleet's releases wall reads one public URL per product. These files are
that door for Brainy and Open Brainy: newest first, honest history from the
changelog, one entry appended by every release from here on.

releases/brainy.json

@@ -0,0 +1,52 @@
+{
+  "product": "brainy",
+  "entries": [
+    {
+      "version": "11.0.3",
+      "date": "2026-09-01",
+      "headline": "The embedding upgrade ceremony runs on every brain",
+      "items": [
+        "A brain opened through the standard plugin now carries its embedding-model identity, so the full-precision upgrade ceremony can run on it.",
+        "A one-fix release; nothing else changed."
+      ],
+      "url": null,
+      "thumb": null
+    },
+    {
+      "version": "11.0.2",
+      "date": "2026-08-31",
+      "headline": "One embedding quality everywhere, 3–4× faster imports",
+      "items": [
+        "Every runtime embeds with the same full-precision model — search quality no longer depends on where you run.",
+        "Bulk embedding measured 3.1–4.2× faster, and an online re-embed ceremony upgrades existing stores without downtime.",
+        "The engine's change feed is documented, with the SSE/WebSocket fan-out pattern for realtime surfaces."
+      ],
+      "url": null,
+      "thumb": null
+    },
+    {
+      "version": "11.0.1",
+      "date": "2026-08-31",
+      "headline": "Deletes inside transactions are safe",
+      "items": [
+        "Deleting relations inside a transact() no longer corrupts index bookkeeping.",
+        "A store that deletes its last relation keeps serving instead of refusing."
+      ],
+      "url": null,
+      "thumb": null
+    },
+    {
+      "version": "11.0.0",
+      "date": "2026-08-28",
+      "headline": "One install, one engine — Brainy",
+      "items": [
+        "The former two-package pair is one package: the native engine under the familiar API. One import is the whole install.",
+        "A missing native build refuses loudly with its cures named; nothing falls back silently.",
+        "Stores open in place — no migration."
+      ],
+      "url": null,
+      "thumb": null
+    }
+  ],
+  "history": "The version line continues from the 4.3.x native-engine releases; their record lives in the product repository's CHANGELOG.md."
+}