Make Gemini embedding calls non-blocking in async embedder paths

[Copilot]

This PR addresses the single review comment on backend/engines/embedder.py: embed_text and embed_text_query were async functions invoking synchronous Gemini SDK calls, which could block the event loop. The change keeps behavior intact while moving the blocking SDK work off the event loop thread.

• Scope (targeted to one review comment)

  • Updated only the embedding call sites in:
    • embed_text(...)
    • embed_text_query(...)

• Implementation

  • Added asyncio import.
  • Replaced direct genai.embed_content(...) calls with await asyncio.to_thread(...) so embedding runs in a worker thread while preserving existing retry/fallback logic and return shape.

• Code example

  result = await asyncio.to_thread(
      genai.embed_content,
      model=model_name,
      content=text,
      task_type="retrieval_document",  # retrieval_query in query path
  )

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Project	Deployment	Actions	Updated (UTC)
stock-iq	Ready	Preview, Comment	May 30, 2026 3:48am