v0.3.1: Enterprise Readiness

RingKernel v0.3.1: Enterprise Readiness

This release adds comprehensive enterprise-grade features for production deployments.

🔐 Enterprise Security

• Real Cryptography: AES-256-GCM, ChaCha20-Poly1305, Argon2 key derivation
• Secrets Management: SecretStore trait with key rotation, caching, and chained stores
• K2K Message Encryption: Kernel-to-kernel encryption with forward secrecy
• TLS/mTLS Support: Full TLS with rustls, certificate rotation, SNI resolution

🔑 Authentication & Authorization

• Authentication Providers: ApiKeyAuth, JwtAuth (RS256/HS256), ChainedAuthProvider
• RBAC: Role-based access control with deny-by-default PolicyEvaluator
• Multi-tenancy: TenantContext, ResourceQuota, usage tracking

📊 Observability

• OpenTelemetry: OTLP export to Jaeger, Honeycomb, Datadog, Grafana Cloud
• Structured Logging: Multi-sink logger with trace correlation (JSON/Text)
• Alert Routing: Severity-based routing with deduplication (Slack, Teams, PagerDuty)
• Remote Audit Sinks: Syslog, CloudWatch Logs, Elasticsearch

⚡ Rate Limiting

• Algorithms: TokenBucket, SlidingWindow, LeakyBucket
• Builder API: Fluent configuration with RateLimiterBuilder
• Distributed: SharedRateLimiter for multi-instance deployments

🔧 Operational Excellence

• Automatic Recovery: Configurable policies per failure type (Restart, Migrate, Checkpoint, Notify, Escalate, Circuit)
• Operation Timeouts: Deadline propagation with Timeout and Deadline types
• Recovery Manager: Retry tracking, cooldown periods, automatic escalation

📦 Feature Flags

[dependencies]
ringkernel-core = { version = "0.3.1", features = ["enterprise"] }

# Or select specific features:
ringkernel-core = { version = "0.3.1", features = ["crypto", "auth", "tls", "rate-limiting", "alerting"] }

📈 Metrics

• Test Coverage: 900+ tests (up from 825+)
• Crates Published: 21 crates to crates.io

🚀 Quick Start

use ringkernel_core::prelude::*;

// Enterprise runtime with production preset
let runtime = RuntimeBuilder::new()
    .production()
    .build()?;

// API key authentication
let auth = ApiKeyAuth::new()
    .add_key("sk-prod-abc123", Identity::new("service-a"));

// Rate limiting
let limiter = RateLimiterBuilder::new()
    .algorithm(RateLimitAlgorithm::TokenBucket)
    .rate(1000)
    .burst(100)
    .build();

Full Changelog

See CHANGELOG.md for complete details.