add docs, protocol, plugins, README, CHANGELOG

docs/LICENSE.md

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+# License
+
+VNOX and LNEx are licensed under the **GNU General Public License v3.0 (GPL-3.0)**.
+
+```
+Copyright (C) 2026 VNOX Contributors
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+```
+
+Full license text: `LICENSE` in the repository root.
+
+---
+
+## What this means
+
+You can:
+- use VNOX for any purpose
+- study and modify the source code
+- distribute copies of VNOX
+- distribute modified versions — but they must also be GPL-3.0
+
+You cannot:
+- distribute VNOX or derivatives under a proprietary license
+- remove copyright notices
+
+## Protocol specification
+
+The LNEx protocol specification (`docs/02-protocol/`) is additionally
+licensed under **CC0 1.0 Universal (Public Domain)**.
+
+This means anyone can implement the LNEx protocol in any language,
+under any license, without restriction. Third-party clients and servers
+are explicitly encouraged.
+
+## Plugins
+
+Plugins you write for VNOX are your own code. The GPL does not automatically
+apply to plugin code — plugins communicate with VNOX via WebSocket RPC,
+which is considered a separate program. You may license your plugins however
+you choose.