docs: add SentinelAI v0.1.0 release notes

Author: CoreyLeath-code

RELEASE_NOTES_v0.1.0.md

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+# SentinelAI v0.1.0
+
+SentinelAI v0.1.0 is the first formal portfolio release of the repository's reproducible drift-monitoring reference system.
+
+## Release scope
+
+The directly implemented statistical path compares expected and observed histograms with Population Stability Index (PSI) and a Kolmogorov-Smirnov CDF distance, then flags drift when the configured thresholds are crossed. The repository's benchmark evidence is synthetic and reproducible; it is not presented as production drift-detection accuracy, native C++ service latency, or fleet-scale throughput.
+
+## Verified repository surface
+
+The release candidate is gated by:
+
+- the Python test suite;
+- Go tests for the ingestion service;
+- a container build for the ingestion service;
+- the repository's existing CI, benchmark, schema-validation, and security workflows.
+
+The existing CI also exercises the ingestion path behind NGINX with three replicas and verifies readiness survives loss of one backend.
+
+## Release artifacts
+
+A successful `v0.1.0` tag publishes:
+
+- a deterministic source archive and SHA-256 checksum on the GitHub Release;
+- the validated Go ingestion-service container at `ghcr.io/coreyleath-code/sentinelai-ingestion:0.1.0`;
+- additional GHCR tags for `0.1` and `latest`.
+
+## Reproducibility
+
+The statistical benchmark can be regenerated with:
+
+```bash
+python benchmarks/run_benchmark.py --output benchmarks/latest.json
+```
+
+The release does not add or imply production authorization, calibrated statistical significance, production model-quality guarantees, or cross-hardware performance guarantees.