Add GitHub workflows, changelog, package.json, and README updates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

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+# Changelog
+
+All notable changes to the Elydora Open Source project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
+
+## [0.1.0] - 2025-03-02
+
+### Added
+- Initial open-source release of Elydora
+- API server with Ed25519 signed operation records (EOR)
+- Chain-hashed audit trails with SHA-256
+- Merkle tree epoch rollups with RFC 3161 TSA anchoring
+- Multi-tenant RBAC with 5 roles
+- Compliance exports (JSON/PDF)
+- Next.js web management console
+- Node.js/TypeScript SDK (v1.2.0) with CLI
+- Python SDK (v1.2.0) with sync and async clients
+- Go SDK (v0.1.0) with CLI
+- Docker Compose one-command deploy
+- Kubernetes Helm chart
+- CONTRIBUTING.md with development setup guide