## What changed
- Add `gpt-6.1-terra` to the bundled catalog and GCP Vertex model picker.
- Add `openai.gpt-6.1-terra` to Amazon Bedrock catalogs, including Global and US cross-region runtime variants.
- Use `gpt-6.1-terra` as GCP's preferred memory consolidation model.
## Testing
Extend catalog, model picker, thread startup, and Vertex request tests to cover GPT-6.1 Terra.
GitOrigin-RevId: edb3be3c4286c191349cdee742005ed3c67029e8
## What changed
Support `model_providers.gcp.credential_file` as an absolute path to a Google Application Default Credentials (ADC) file. Pass it as `GOOGLE_APPLICATION_CREDENTIALS` in the provider auth command's environment, retaining the override for token refreshes without changing the parent process environment.
Validate the path before merging GCP defaults and preserve the setting in thread configuration serialization.
## Testing
Add coverage for invalid paths, configuration round trips, separate provider token caches, and credential overrides retained after a `401` refresh. Include a Windows regression test for credential paths containing command metacharacters.
GitOrigin-RevId: d9a1d4b3775a9a4c4325dddaa153d92a2d1430a0
## Why
The sequential token fixture rewrites shared files when resolving credentials. Concurrent credential resolution needs a fixture that can return the same token independently for each caller.
## What changed
Add `ProviderAuthCommandFixture::fixed_token`, which reads a token file using `cat` on Unix or `cmd.exe` on Windows without modifying it. Use it in the Vertex command-auth and guardian-request tests.
GitOrigin-RevId: 5bf5134f113b546a643a47012281fb960e885b15
## What changed
- Support `model_provider = "gcp"` with a Vertex AI endpoint derived from `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION`, defaulting to the `global` location.
- Obtain credentials through `gcloud auth application-default print-access-token` by default, and allow `base_url`, `auth`, and `http_headers` overrides under `model_providers.gcp`.
- Use a static model catalog tailored to Vertex AI, preserve function tools, namespaces, and client-side tool search, and support remote compaction V2. Disable unsupported reasoning summaries, Responses Lite, custom tools, web search, and image generation.
- Expose a `gcp` account type through the app-server protocol and generated clients without resolving credentials during account reads or requiring OpenAI authentication.
## Testing
Add coverage for endpoint resolution, configuration overrides, model catalog filtering, authenticated requests, unsupported request fields, missing credentials, account reporting across provider changes, and automatic remote compaction.
GitOrigin-RevId: 97a3158269e6dbc2605e2cf576998e09817ea12a
BOZHANG-OAI