Add Qwen3.8 Max to OpenRouter

[brynary]

Summary

• add Qwen3.8 Max to the built-in OpenRouter model catalog
• record its context and output limits, multimodal and reasoning capabilities, prompt-cache pricing, and supported reasoning levels
• add a focused catalog snapshot test

Sources

• https://qwen.ai/blog?id=qwen3.8
• https://openrouter.ai/qwen/qwen3.8-max

Testing

• cargo +nightly-2026-04-14 fmt --check --all
• cargo nextest run -p fabro-model
• cargo +nightly-2026-04-14 clippy -p fabro-model --all-targets -- -D warnings
• git diff --check

[Copilot]

Pull request overview

Adds Qwen3.8 Max to the built-in OpenRouter model catalog in fabro-model, including limits, capabilities, reasoning controls, and pricing metadata, plus a targeted snapshot test to guard the catalog entry.

Changes:

• Added the qwen3.8-max OpenRouter catalog entry with context/max-output limits, feature flags (tools/vision/reasoning/prompt-cache), reasoning-effort levels, and pricing.
• Added a focused unit test + insta debug snapshot to ensure the model is present when OpenRouter is enabled and that key settings (api_id, reasoning defaults, controls) match expectations.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
lib/foundation/fabro-model/src/catalog/providers/openrouter.toml	Adds the qwen3.8-max model definition (limits, features, controls, costs) to the OpenRouter built-in catalog.
lib/foundation/fabro-model/src/catalog.rs	Adds an insta snapshot test ensuring the new OpenRouter model is included and its settings are correct when enabled.

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