chore: add mit license

LICENSE

@@ -1,62 +1,21 @@
-Copyright (c) 2025 echoHello
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-1. Redistributions of source code must retain the above copyright notice, this
-   list of conditions and the following disclaimer.
-
-2. Redistributions in binary form must reproduce the above copyright notice,
-   this list of conditions and the following disclaimer in the documentation
-   and/or other materials provided with the distribution.
-
-3. Neither the name of the copyright holder nor the names of its
-   contributors may be used to endorse or promote products derived from
-   this software without specific prior written permission.
-
-4. Notwithstanding any other provision of this License, and as a material
-   condition of the rights granted herein, licensees are strictly prohibited from
-   altering, removing, obscuring, or replacing any "yell" branding, including but
-   not limited to the name, logo, or any visual, textual, or symbolic identifiers
-   that distinguish the software and its interfaces, in any deployment or
-   distribution, regardless of the number of users, except as explicitly set forth in Clauses 5
-   and 6 below.
-
-5. The branding restriction enumerated in Clause 4 shall not apply in the
-   following limited circumstances: (i) deployments or distributions where the total
-   number of end users (defined as individual natural persons with direct access to the
-   application) does not exceed fifty (50) within any rolling thirty (30) day
-   period; (ii) cases in which the licensee is an official contributor to the
-   codebase—with a substantive code change successfully merged into the main branch of the
-   official codebase maintained by the copyright holder—who has obtained specific
-   prior written permission for branding adjustment from the copyright holder; or
-   (iii) where the licensee has obtained a duly executed enterprise license expressly
-   permitting such modification. For all other cases, any removal or alteration of
-   the "yell" branding shall constitute a material breach of license.
-
-6. By contributing to this project after December 29, 2025, you agree to license your
-   contributions under this license and acknowledge that echoHello may use your
-   contributions in both the open-source version and any commercial offerings.
-   Prior to this date, all contributions remain under their original MIT license terms.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
----
-
-## Enterprise Licensing
-
-For enterprise white-label licensing, custom branding rights, or commercial
-deployments exceeding 50 users, please contact:
-
-- GitHub: https://github.com/echohello-dev/yell
-- Email: business@echohello.dev
+MIT License
+
+Copyright (c) 2026 echoHello
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.