Add Agon and AutoNumerics to Task-Specific Agents

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Add two papers to the Task-Specific Agents section:

• Agon (Sun et al., 2026): A large language model-based research orchestrator that organizes autonomous scientific discovery around reusable scientist/coder/auditor loops, deployed across 10+ disciplines over 444 Prompt Economy iterations.
• AutoNumerics (Du et al., 2026): A multi-agent pipeline that autonomously designs, implements, and verifies numerical PDE solvers from natural language descriptions, achieving geometric mean nRMSE of 9.00e-9 on CodePDE benchmarks.