Luis Pater 5dc428f392 fix(gemini): append trailing user turn for requests ending with model content ...

- Ensure Gemini, AI Studio, Vertex, and Antigravity requests end with a user turn to prevent upstream errors when trailing with model content.
- Preserve trailing turns that contain a function response and skip trailing adjustments for `countTokens` actions or Claude models.
- Introduce boundary normalization helpers to validate both leading and trailing turn roles.

Closes: #5358

2026-09-06 23:41:12 +08:00

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fix(gemini): append trailing user turn for requests ending with model content

2026-09-06 23:41:12 +08:00