feat(cpp): vendor Catch2 v3.5.0 amalgamated

BSL-1.0. Single-header + single-source para tests con ctest.
2026-04-28 23:42:08 +02:00
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+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
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+# Catch2 v3.5.0 (amalgamated)
+
+Single-header + single-source vendored copy of [Catch2](https://github.com/catchorg/Catch2)
+v3.5.0, used by `cpp/tests/`.
+
+License: Boost Software License 1.0 (BSL-1.0). See `LICENSE`.
+
+Files:
+- `catch_amalgamated.hpp` — single header (include this).
+- `catch_amalgamated.cpp` — single TU compiled once into the `catch2` static lib.
+
+To update: download new `catch_amalgamated.{hpp,cpp}` from the upstream releases page
+and replace the two files. No other changes needed.