fix: add Mistral models mistral-medium-3.5 +2 more

[github-actions]

fix: add Mistral models mistral-medium-3.5 +2 more

Closes #505

Source issue: #505

Summary

Field	Value
Provider	mistral
Primary model	mistral-medium-3.5
Changed models	mistral-medium-3.5 mistral-medium-3 mistral-medium-3-5-26-04
Added models	mistral-medium-3.5 mistral-medium-3 mistral-medium-3-5-26-04
Updated models	None
Verification sources	1 2 3

Verified metadata

Model	Display name	Parent	Providers	Format	Flavor	Token limits	Pricing	Lifecycle
mistral-medium-3.5	Mistral Medium 3.5		mistral	openai	chat	input=256000, output=not provided	in/out=1.5/7.5 per 1M	multimodal=true
mistral-medium-3	Mistral Medium 3	mistral-medium-3.5	mistral	openai	chat	input=256000, output=not provided	in/out=1.5/7.5 per 1M	parent=mistral-medium-3.5; multimodal=true
mistral-medium-3-5-26-04	Mistral Medium 3.5 (2026-04)	mistral-medium-3.5	mistral	openai	chat	input=256000, output=not provided	in/out=1.5/7.5 per 1M	parent=mistral-medium-3.5; multimodal=true

Verification notes

No LLM verification step ran — model metadata was already complete in the issue.

sync_models vs proposed update

sync_models cross-check found differences. Official provider verification was used for the applied values, and sync_models discrepancies are listed below for review.

Model	Field	Proposed update	sync_models	sync_models source models
mistral-medium-3.5	catalog entry	present	missing	None
mistral-medium-3	catalog entry	present	missing	None
mistral-medium-3-5-26-04	catalog entry	present	missing	None

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