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Kyle Carberry
742694eb20
## Problem Anthropic rejects requests containing empty text content blocks with: ``` messages: text content blocks must be non-empty ``` Empty text parts (`""` or whitespace-only like `" "`) get persisted in the database when a stream sends `TextStart`/`TextEnd` with no `TextDelta` in between. On the next turn, these parts are loaded from the DB and sent to Anthropic, which rejects them. ## Fix Filter empty/whitespace-only text and reasoning parts at the two LLM dispatch boundaries, without modifying persistence (the raw record is preserved): - **`partsToMessageParts()`** in `chatprompt.go` — filters when converting persisted DB messages to fantasy message parts for LLM calls. This is the last gateway before the Anthropic provider creates `TextBlockParam` objects. - **`toResponseMessages()`** in `chatloop.go` — filters when building in-flight conversation messages between steps within a single turn. Note: `flushActiveState()` (the interruption path) already had this guard — the normal `TextEnd` streaming path did not, but since we're not changing persistence, the fix is applied at the dispatch layer.