fix: preserve prompt cache across runtime memory writes - #28
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Summary
systemPrompt.context()snapshot path instead of a mutable system-prompt section{{}}interpolation and per-Agent workspace overridesWhy
Runtime Memory writes changed the system prompt at the start of every request, invalidating the reusable prefix containing tools and conversation history. DSH runtime-context snapshots keep that prefix stable and append a new user-role snapshot only when the projection changes.
Verification
pnpm run verifyCloses #26