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CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2026-02-19
+
+### Added
+- Initial release of Multi-OrBAC PostgreSQL extension
+- Complete Multi-OrBAC implementation based on CNRS research paper
+- Core features:
+  - Organization-centric access control
+  - Role-based abstraction with organizational scope
+  - Activity and view abstractions
+  - Context-based rule evaluation
+  - Four deontic modalities (permission, prohibition, obligation, recommendation)
+  - Prohibition precedence over permissions
+  - Multi-organization support
+- Advanced features:
+  - Organization, role, activity, and view hierarchies with transitive closure
+  - Temporal delegation with time bounds
+  - Negative role assignments
+  - Separation of Duty (SoD) constraints
+  - Role cardinality constraints (min/max users)
+  - Derived roles (computed via functions)
+  - Cross-organizational rules
+  - Administration rules (meta-policies)
+- Policy DSL with idempotent compiler
+- RLS helper functions for PostgREST integration
+- Comprehensive test suite with 20 test scenarios
+- Complete documentation
+- Build and installation automation (Makefile, install.sh)
+
+[1.0.0]: https://github.com/yourusername/morbac_pg/releases/tag/v1.0.0