fix: rename LICENSE.md to LICENSE so GitHub detects MIT correctly

GitHub license auto-detection requires a file named LICENSE containing
the full license text. LICENSE-MIT and LICENSE-APACHE remain for
dual-license reference.

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Sunil Thakare
+
+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.

LICENSE.md

@@ -1,10 +0,0 @@
-# License
-
-ChronoSeal is dual-licensed under either of the following, at your option:
-
-- **MIT License** ([LICENSE-MIT](LICENSE-MIT) or https://opensource.org/licenses/MIT)
-- **Apache License, Version 2.0** ([LICENSE-APACHE](LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)
-
-Unless you explicitly state otherwise, any contribution intentionally submitted
-for inclusion in ChronoSeal by you, as defined in the Apache-2.0 license,
-shall be dual-licensed as above, without any additional terms or conditions.