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).

CONTRIBUTING.md

@@ -0,0 +1,50 @@
+# Contributing to sem_cython12
+
+Thank you for your interest in `sem_cython12`.
+
+## Scope of this repository
+
+This repository distributes pre-built binaries and the public Python
+wrapper only.  The implementation source code is not published here
+and external code contributions to the kernels are not accepted at
+this time.
+
+## What you can contribute
+
+- **Bug reports.**  Open an issue at
+  https://git.sevana.biz/vvs/sem_cython12/issues with:
+  - OS, CPU architecture, glibc version (Linux) or Windows build,
+  - Python version (`python --version`),
+  - NumPy version,
+  - a minimal reproducer (small array shapes preferred),
+  - the full traceback or observed vs. expected output.
+
+- **Documentation fixes.**  Typos, broken links, unclear wording in
+  `README.md` or `CHANGELOG.md` are welcome via issue or pull request.
+
+- **Usage questions.**  Use the issue tracker.  Please search existing
+  issues first.
+
+## What is out of scope here
+
+- Pull requests modifying `sem_cython12/sem_core12*.so` or
+  `sem_cython12/sem_core12*.pyd` (binary artefacts, built from a
+  separate source tree).
+- Pull requests adding new numerical functions to
+  `sem_cython12/wrapper.py` (the wrapper mirrors a closed kernel API).
+- Algorithmic discussion of the underlying methods.
+
+## Security issues
+
+Do not file security issues on the public tracker.  See
+[`SECURITY.md`](./SECURITY.md).
+
+## Commercial inquiries
+
+For commercial licensing, custom builds (including macOS), or
+integration support, contact `sales@sevana.biz`.
+
+## Code of conduct
+
+Be respectful and on-topic.  Off-topic, abusive, or commercially
+solicitous issues will be closed without comment.