Gemini 3 Pro Preview has been deprecated in favor of Gemini 3.1 Pro.
This removes the `Gemini3Pro` variant from the `Model` enum and all
associated match arms, updates eval model lists, docs, and test
fixtures.
A serde alias (`"gemini-3-pro-preview"`) is kept on `Gemini31Pro` so
existing user settings gracefully migrate to the replacement model.
Closes AI-66
Release Notes:
- Removed deprecated Gemini 3 Pro Preview model; existing configurations
automatically migrate to Gemini 3.1 Pro.
GitHub allows defining a default shell for all jobs on the workflow
level, which we did not use before, yet practically did when it comes
down to our usage of `named::bash`. Since this makes stuff quite
verbose, I decided on using the defaults instead so the workflows become
somewhat easier to audit when reading the generated files.
Powershell steps continue to use Powershell, only the default for bash
scripts was modified.
Release Notes:
- N/A
For now, just using Sonnet 4.5 and Opus 4.5 - I'll make a separate PR
for non-Anthropic models, in case they introduce new failures.
Release Notes:
- N/A
Richard Feldman