a77a16c494
Add support for object-style entries in fallback_models arrays, enabling per-model configuration of variant, reasoningEffort, temperature, top_p, maxTokens, and thinking settings. - Zod schema for FallbackModelObject with full validation - normalizeFallbackModels() and flattenToFallbackModelStrings() utilities - Provider-agnostic model resolution pipeline with fallback chain - Session prompt params state management - Fallback chain construction with prefix-match lookup - Integration across delegate-task, background-agent, and plugin layers