agent-platform release v4.100.0

Claude Sonnet 5.5 is priced in the LLM routing catalog: llmRouting.modelCatalog.providers.anthropic.models.claude-sonnet-5-5. Input $2, output $10, cache reads $0.20 and 5-minute cache writes $2.50 per million tokens, from Anthropic’s pricing page, the same as Claude Sonnet 5. The data plane’s built-in catalog (agentgateway 2.1.2) does not price the model, so without the entry every lookup misses and the gateway emits no cost sample for its calls. Both charts carry it.