Add AGPL-3.0 dual license with commercial option

Added LICENSE file with dual licensing:
- Primary license: AGPL-3.0 for open source use
- Commercial licenses available from copyright holder
- AGPL-3.0 licenses are irrevocable (cannot be revoked)
- Commercial licensing rights reserved only for commercial use cases
- Clarifies that non-commercial use is governed by AGPL-3.0

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

LICENSE

@@ -0,0 +1,40 @@
+BalanceBoard License
+
+Copyright (c) 2025 Chelsea. All rights reserved.
+
+This software is dual-licensed:
+
+1. OPEN SOURCE LICENSE (AGPL-3.0)
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+2. COMMERCIAL LICENSE
+
+   The copyright holder reserves the right to offer separate commercial licenses
+   to any party for commercial use cases where the AGPL-3.0 terms are not suitable.
+
+   Commercial licenses, once granted, are irrevocable except for breach of the
+   commercial license terms themselves.
+
+   For commercial licensing inquiries, contact: chelsea.lee.woodruff@gmail.com
+
+CLARIFICATIONS:
+
+- This dual-licensing only applies to commercial use rights
+- Non-commercial use is governed solely by AGPL-3.0
+- The copyright holder does not reserve the right to revoke AGPL-3.0 licenses
+- Once granted under AGPL-3.0, your rights under that license cannot be revoked
+- The copyright holder only reserves the right to offer additional commercial licenses
+
+Full text of AGPL-3.0: https://www.gnu.org/licenses/agpl-3.0.txt