Initial commit: Elydora Open Source — self-hosted audit platform for AI agents

Full self-hosted port of the Elydora tamper-evident audit protocol:
- Hono API server with PostgreSQL, Redis, MinIO adapters
- Ed25519 signed operations, chain hashing, Merkle epoch rollups
- PBKDF2 password hashing, HMAC-SHA256 JWT, 5-role RBAC
- Next.js management console
- Node.js, Python, and Go SDKs
- Docker Compose for local deployment
- Helm chart for Kubernetes
- Comprehensive security hardening and audit fixes applied

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sdks/node/src/errors.ts

@@ -0,0 +1,23 @@
+import type { ErrorCode } from './types.js';
+
+export class ElydoraError extends Error {
+  public readonly code: ErrorCode;
+  public readonly requestId: string;
+  public readonly statusCode: number;
+  public readonly details?: Record<string, unknown>;
+
+  constructor(
+    statusCode: number,
+    code: ErrorCode,
+    message: string,
+    requestId: string,
+    details?: Record<string, unknown>,
+  ) {
+    super(message);
+    this.name = 'ElydoraError';
+    this.statusCode = statusCode;
+    this.code = code;
+    this.requestId = requestId;
+    this.details = details;
+  }
+}