feat: add multiplayer capture vertical slice

devtools/blockbench-mcp/NOTICE.md

@@ -0,0 +1,19 @@
+# Third-party notice and license boundary
+
+The hardened Blockbench MCP development tool is a modified build of
+[`jasonjgardner/blockbench-mcp-plugin`](https://github.com/jasonjgardner/blockbench-mcp-plugin),
+pinned to version 1.6.1 / commit
+`6b069e308fdfc9b0a1c15bc924ca78150815f143`.
+
+Upstream and the modified build are licensed under **GPL-3.0-only**. The full
+license text is stored in `LICENSES/GPL-3.0-only.txt`. Changes made by
+ProjectCapture are represented by the patch in `patches/` and are clearly
+marked as a hardened ProjectCapture variant.
+
+The official Hytale Models plugin is a separate GPL-3.0 program and is pinned
+by repository commit and distribution checksum in `upstream.lock.json`.
+
+These Blockbench plugins are development tools. They are not embedded in, linked
+into, or distributed as part of the Hytale runtime mod. Any redistribution of a
+generated plugin artifact must include the corresponding source/pinned patchset,
+this notice, and the GPL license.