The Gemini HTTP API provider only set thoughtSignature (camelCase) when
building tool call request bodies. Gemini 2.5 models accept camelCase,
but Gemini 3.5 Flash Agentic reasoning requires thought_signature
(snake_case) — matching the format it returns in API responses. When
only the camelCase variant was sent, Gemini 3.5 Flash rejected the
request with a 400 Bad Request for missing thought_signature.
The fix sets both ThoughtSignature and ThoughtSignatureSnake in the
geminiPart struct, matching the pattern already used in
antigravity_provider.go. This ensures compatibility with both Gemini
2.x (camelCase) and Gemini 3.x Agentic (snake_case) models.
Closes#3111
* Support streaming
* fix: stream pico reasoning updates
Route Pico reasoning through the active streamer and hide empty thought placeholders.
* fix: harden configured streaming delivery
* fix ci
* fix split issue
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