chore(deps): update dependency @earendil-works/pi-ai to v0.84.4

[standards-reviewer]

This PR contains the following updates:

Package	Change	Age	Confidence
@earendil-works/pi-ai (source)	0.84.3 → 0.84.4

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Release Notes

earendil-works/pi (@​earendil-works/pi-ai)

v0.84.4

Compare Source

Added

• Added the experimental vision-capable deepseek-v4-flash-vision-exp model to the DeepSeek catalog.

Fixed

• Fixed OpenAI-compatible Chat Completions ignoring an explicitly requested toolChoice when no tools are defined.
• Fixed thinking signature serialization to run once after the signature is complete (#​8671).
• Fixed fragmented Mistral tool calls splitting when continuation chunks omit the tool-call ID (#​8387).
• Fixed OpenAI-compatible reasoning replay to merge consecutive streamed text and summary reasoning_details deltas.
• Fixed the Cloudflare AI Gateway catalog to include supported workers-ai/* passthrough models omitted by models.dev.
• Fixed OpenRouter reasoning controls by deriving off support and available effort levels from OpenRouter's model metadata, preventing reasoning-mandatory models from receiving effort: "none" (#​8614 by @​davidbrai).

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[standards-reviewer]

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