Add A3M Router - parallel multi-LLM execution with confidence scoring

[Das-rebel]

Add A3M Router to Intelligent AI model routing section.

Open-source LLM router that runs queries across 47+ providers in parallel with confidence voting (not sequential fallback). Independent benchmark validated with 62% cost savings and 99.5% routing accuracy. 19.5 KB CLI, zero ML dependencies.

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🏆 RouterArena #1 — 🏆 RouterArena #1: A3M scored 76.43 on the official LLM router benchmark — beating Microsoft Azure (71.87), OpenAI GPT-5 (64.32), and RouteLLM (48.07). Results: RouteWorks/RouterArena#113

[Das-rebel]

Quick update: A3M Router just achieved 🥇 #1 on the RouterArena leaderboard (Score: 0.7643), beating 16 other routers including NotDiamond, RouteLLM, and RouterBench.

Key metrics from the evaluation:

• 3.6x cheaper than the previous feat: add TensorOpera Router and remove unnecessary asterisks #1 (/bin/bash.05 vs /bin/bash.18 per 1K queries)
• 8.5x better optimal selection (0.6339 vs 0.0741)
• 76.28% accuracy across 8,400 queries, 5 model providers

Full RouterArena results

This adds independent third-party validation to A3M Router's claims around cost efficiency and routing quality.