[BOT ISSUE] Fireworks: add missing Google Gemma 4 models (31B, 26B, E4B)

[github-actions]

Summary

Google's Gemma 4 model family is available on Fireworks serverless inference but missing from the catalog. These are major new-generation open-weight models.

Missing Models

Model ID	Display Name	Context Window
accounts/fireworks/models/gemma-4-31b-it	Gemma 4 31B IT	262K
accounts/fireworks/models/gemma-4-26b-a4b-it	Gemma 4 26B A4B IT	262K
accounts/fireworks/models/gemma-4-e4b	Gemma 4 E4B	131K

Context

• The catalog has Gemma 3 variants on Fireworks (e.g., gemma-3-27b-it) but no Gemma 4 entries
• Gemma 4 is Google's latest open-weight model family, widely available across providers
• Exact model IDs should be verified via the Fireworks API before adding

Sources

• Fireworks AI Models — lists Gemma 4 models on serverless inference
• Google Gemma 4 announcement — confirms Gemma 4 as a production model family

[github-actions]

Autofix skipped because the issue body/title did not contain parseable bot metadata for a model catalog change.