Create CHANGELOG.md

Author: SamuraiWriter7

CHANGELOG.md

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+# Changelog
+
+All notable changes to this repository will be documented in this file.
+
+This project follows a draft-oriented versioning model while the specification remains experimental.
+
+---
+
+## [Unreleased]
+
+### Planned
+
+- Add additional v0.2 examples for:
+  - high-confidence natural-source assessment
+  - hybrid structural-originality assessment
+  - disputed-origin assessment
+  - declaration-conflict assessment
+- Add a dedicated review-routing model document.
+- Add relationship documents for:
+  - CollapseMonitor
+  - Royalty Readiness
+  - Trace Protocol
+  - Structure Fingerprint
+- Extend the schema to support:
+  - detailed scoring model output
+  - warning-flag detail objects
+  - recursive synthetic risk output
+  - review-routing metadata
+
+### Notes
+
+The next stage should focus on making the v0.2 model more operational without turning purity scoring into automatic legal or financial judgment.
+
+---
+
+## [0.2.0] - 2026-05-25
+
+### Added
+
+- Added initial `README.md` for **AI Purity Detection Algorithm v0.2**.
+- Added `docs/v0.2-roadmap.md` to define the proposed direction for the v0.2 specification.
+- Added `docs/scoring-weighting-model.md` to define a draft signal-weighting and confidence-adjusted scoring model.
+- Added `docs/warning-flag-severity-model.md` to define warning-flag severity levels, review routing, and downstream impact handling.
+- Added `schemas/purity-assessment.schema.json` for validating purity assessment examples.
+- Added `examples/purity-assessment.sample.yaml` as a standard purity assessment example.
+- Added `examples/purity-assessment.low-confidence.sample.yaml` to demonstrate weak provenance, unclear origin, low confidence, review-required routing, and blocked royalty-readiness status.
+- Added `examples/purity-assessment.recursive-synthetic-risk.sample.yaml` to demonstrate high recursive synthetic risk, weak primary-source provenance, high AI-pattern similarity, blocked training use, and blocked royalty-readiness status.
+- Added `.github/workflows/validate-examples.yml` to validate YAML examples against the JSON Schema.
+- Added `LICENSE`.
+
+### Defined
+
+- Defined `origin_purity_score` as a normalized estimate of source-origin composition.
+- Defined `ai_generated_ratio` as a separate estimate of AI-generated or AI-assisted content ratio.
+- Defined `warning_flags` as routing and review-support signals.
+- Defined a draft signal-weighting model using:
+  - `provenance_evidence_score`
+  - `author_declaration_score`
+  - `structural_originality_score`
+  - `revision_lineage_score`
+  - `citation_transparency_score`
+  - `ai_pattern_risk_score`
+  - `structure_fingerprint_distinctiveness_score`
+  - `recursive_synthetic_risk_score`
+  - `signal_confidence_quality_score`
+- Defined warning severity levels:
+  - `info`
+  - `warning`
+  - `review_required`
+  - `blocking`
+- Defined review-routing modes:
+  - `none`
+  - `recommended`
+  - `required`
+  - `blocking_review`
+
+### Validation
+
+- Added GitHub Actions validation for:
+  - `examples/purity-assessment.sample.yaml`
+  - `examples/purity-assessment.low-confidence.sample.yaml`
+  - `examples/purity-assessment.recursive-synthetic-risk.sample.yaml`
+- Confirmed that all three example files pass validation against:
+  - `schemas/purity-assessment.schema.json`
+
+### Notes
+
+This release establishes **AI Purity Detection Algorithm v0.2** as a draft algorithmic layer for source-preservation systems.
+
+The specification focuses on:
+
+- origin-purity scoring
+- natural / synthetic data separation
+- hybrid data classification
+- recursive synthetic risk detection
+- warning-flag severity
+- confidence handling
+- review routing
+- downstream-use guidance
+- model-collapse monitoring support
+- royalty-readiness review support
+
+This release does not attempt to:
+
+- prove legal authorship
+- determine copyright ownership
+- automatically assign royalties
+- ban AI-assisted creation
+- punish synthetic content
+- perfectly detect AI-generated text
+- replace human or multi-wing review
+
+The core principle remains:
+
+```text
+Purity is not moral judgment.
+Purity is ecological signal.