Steve Dudenhoeffer a6b5544674 refactor(v2/anthropic): use MultiSystem for system prompts ...

Switches buildRequest to emit anthReq.MultiSystem instead of anthReq.System
whenever a system message is present. Upstream's MarshalJSON prefers
MultiSystem when non-empty, so the wire format is unchanged for requests
without cache_control. This refactor is a prerequisite for attaching
cache_control markers to system parts in the next commit.

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

2026-04-09 19:26:55 +00:00

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