Nenya v0.1.0 – Secure AI Gateway Launch

• Initial public release of Nenya, a high‑performance, zero‑dependency Go AI gateway.
• Implements secure request handling with strict body size limits, header sanitization, and context‑aware timeouts.
• Dynamic provider discovery and model catalog merging for transparent multi‑provider routing.
• Ollama “Bouncer” engine for on‑the‑fly payload summarization and PII redaction when exceeding soft limits.
• Full circuit‑breaker and retry logic for resilient upstream communication.
• Per‑model token‑usage tracking and latency‑based auto‑reordering of providers.
• Prometheus metrics, health‑check endpoint, and structured slog output.
• Comprehensive GoDoc, Go standard‑library only, and passes all lint/formatting checks.