Create CHANGELOG.md

Author: SamuraiWriter7

CHANGELOG.md

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+## [0.1.1] - 2026-05-25
+
+### Added
+
+- Added `docs/purity-detection-algorithm.md` to define the draft algorithmic framework for estimating origin purity.
+- Added `examples/purity-assessment.sample.yaml` as a sample purity assessment output.
+- Added `schemas/purity-assessment.schema.json` for validating purity assessment records.
+- Added `.github/workflows/validate-examples.yml` to validate YAML examples against JSON Schemas.
+- Added a `Validation` section to `README.md`.
+
+### Changed
+
+- Updated `README.md` Repository Structure to include `purity-assessment.sample.yaml` and `purity-assessment.schema.json`.
+- Updated `README.md` Start Here section to include the Purity Detection Algorithm and Purity Assessment Example.
+- Expanded the `PurityProtocol` layer from a conceptual protocol component into a documented, example-backed, and CI-validated specification layer.
+
+### Notes
+
+This release strengthens the purity assessment layer of the Epicenter Preservation OS Protocol.
+
+The added purity layer supports:
+
+- natural / synthetic data separation
+- hybrid data classification
+- recursive synthetic data risk detection
+- model collapse monitoring
+- reference auditing
+- royalty readiness review
+
+This update does not define legal authorship, copyright ownership, or final royalty allocation.  
+It provides a review-support and ecosystem-health layer for future protocol development.