[python-genai] Live `AsyncSession.send_tool_response` fails with `TypeError` when `FunctionResponse.parts` carries inline bytes

## Observed symptom Live `AsyncSession.send_tool_response` fails with `TypeError` when `FunctionResponse.parts` carries inline bytes - Programming language: Python 3.14 (also reproduced on 3.10) - OS: Linux - Package version: `google-genai` 2.25.0 The Live API's function responses accept multimodal `parts`, and the Gemini 3.x Live models read an image sent that way. For example, `gemini-3.8-live` and `gemini-3.1-flash-live-preview` correctly describe a PNG, JPEG or WebP returned from a tool. However, `AsyncSession.send_tool_response` can't send such a response. It serializes with `_common.convert_to_dict`, which leaves `FunctionResponseBlob.data` as raw `bytes`, and then passes the result to `json.dumps`: ## Literal error text ``` TypeError: Object of type bytes is not JSON serializable ``` ## Environment GitHub googleapis/python-genai #3022 ## Trigger / context Public GitHub report in googleapis/python-genai (FRESH_7D). ## Source evidence - https://github.com/googleapis/python-genai/issues/3022 (2026-09-30T11:36:02Z) — evidence_class: PRIMARY_ISSUE_REPORT — #3022 ## Freshness - classification: FRESH_7D - retrieved_at: 2026-10-02T09:52:00.922591Z - scout_id: C8208e44284 ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.