fusion

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Matthew Greenberg e7ea1257ff feat(engine): add systemPromptLayers to AgentRuntimeOptions and wire into DefaultResourceLoader

Extends AgentRuntimeOptions and AgentOptions with an optional
systemPromptLayers field (SystemPromptLayers) for cross-session prompt
caching. DefaultResourceLoader now uses the stable layer as
systemPromptOverride and the dynamic layer as appendSystemPromptOverride
when layers are provided, falling back to the flat systemPrompt string
for backward compatibility.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-10 16:03:32 -04:00