v1.0.0: Windows AMD64 binary + patent/trade-mark reservation + release docs

- LICENSE §7: no-patent-grant + future-patent reservation; SIM/SEM
  trade-mark reservation with nominative-use exception; sem_cython12
  technical name explicitly NOT a trade mark.
- LICENSE §10: third-party components disclosure (NumPy BSD-3, OpenMP).
- Add Windows AMD64 cp312 binary alongside the Linux x86_64 one.
- README: compatibility table, build provenance, no-telemetry section.
- CHANGELOG.md, CONTRIBUTING.md, SECURITY.md (info@sevana.biz, 5 BD ack).

CHANGELOG.md

@@ -0,0 +1,63 @@
+# Changelog
+
+All notable changes to `sem_cython12` are recorded in this file.
+
+The project follows [Semantic Versioning](https://semver.org/): a
+release `MAJOR.MINOR.PATCH` increments
+
+- `MAJOR` on breaking API changes,
+- `MINOR` on backwards-compatible feature additions,
+- `PATCH` on backwards-compatible bug fixes.
+
+## [1.0.0] - 2026-05-09
+
+First public release.
+
+### Included
+
+- Pre-compiled Linux x86_64 binary (`sem_core12.cpython-312-x86_64-linux-gnu.so`)
+  built with gcc 13.3, OpenMP-parallel (`libgomp`), `-O3 -ffast-math
+  -march=native`.
+- Pre-compiled Windows AMD64 binary (`sem_core12.cp312-win_amd64.pyd`)
+  built with MSVC v14.50 (Visual Studio Build Tools 2026),
+  OpenMP-parallel (`vcomp`), `/O2 /openmp`.
+- Python wrapper module `sem_cython12.wrapper` exposing the public
+  numerical API.
+- Single runtime dependency: `numpy >= 1.23`.
+
+### API surface
+
+Configuration:
+- `available()`, `backend()`, `get_num_threads()`, `set_num_threads(n)`.
+
+Distance and similarity:
+- `batch_max_similarity(X_query, X_members, lam)`
+- `concept_support_matrix(X_query, member_mats, lam)`
+- `pairwise_distances(X)`
+- `nn_distances(X)`
+
+Best-tradeoff filtering:
+- `pareto_core_mask(S)`
+- `one_sided_mask(S)`
+- `non_redundant_witnesses(S)`
+
+Vector reduction:
+- `extend_frontier_kernel(cur_centers, cur_radii, new_emb, cur_arity)`
+
+### Compatibility
+
+- CPython 3.12 (cp312) only in this release.  Other Python versions
+  are not supported.
+- Linux x86_64 with glibc 2.31 or newer (Ubuntu 20.04 LTS and later,
+  RHEL 9 and later, Debian 11 and later).
+- Windows 10 / Windows 11 / Windows Server 2019+, AMD64 only.
+- macOS binaries are not provided in this release.  Contact
+  `sales@sevana.biz` if you need a macOS build.
+
+### Notes
+
+- Thread count defaults to roughly 50% of the host's logical cores.
+  Override via `sem_cython12.wrapper.set_num_threads(n)` or the
+  `SEM_NUM_THREADS` environment variable.
+- The library performs no network I/O, opens no sockets, and writes
+  no files outside the calling process's working directory.