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## Why `codex-models-manager` had grown to own provider-specific concerns: constructing OpenAI-compatible `/models` requests, resolving provider auth, emitting request telemetry, and deciding how provider catalogs should be sourced. That made the manager harder to reuse for providers whose model catalog is not fetched from the OpenAI `/models` endpoint, such as Amazon Bedrock. This change moves provider-specific model discovery behind provider-owned implementations, so the models manager can focus on refresh policy, cache behavior, picker ordering, and model metadata merging. ## What Changed - Introduced a `ModelsManager` trait with separate `OpenAiModelsManager` and `StaticModelsManager` implementations. - Added `ModelsEndpointClient` so OpenAI-compatible HTTP fetching lives outside `codex-models-manager`. - Moved `/models` request construction, provider auth resolution, timeout handling, and request telemetry into `codex-model-provider` via `OpenAiModelsEndpoint`. - Added provider-owned `models_manager(...)` construction so configured OpenAI-compatible providers use `OpenAiModelsManager`, while static/catalog-backed providers can return `StaticModelsManager`. - Added an Amazon Bedrock static model catalog for the GPT OSS Bedrock model IDs. - Updated core/session/thread manager code and tests to depend on `Arc<dyn ModelsManager>`. - Moved offline model test helpers into `codex_models_manager::test_support`. ## Metadata References The Bedrock catalog metadata is based on the official Amazon Bedrock OpenAI model documentation: - [Amazon Bedrock OpenAI models](https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-openai.html) lists the Bedrock model IDs, text input/output modalities, and `128,000` token context window for `gpt-oss-20b` and `gpt-oss-120b`. - [Amazon Bedrock `gpt-oss-120b` model card](https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-openai-gpt-oss-120b.html) lists the `bedrock-runtime` model ID `openai.gpt-oss-120b-1:0`, the `bedrock-mantle` model ID `openai.gpt-oss-120b`, text-only modalities, and `128K` context window. - [OpenAI `gpt-oss-120b` model docs](https://developers.openai.com/api/docs/models/gpt-oss-120b) document configurable reasoning effort with `low`, `medium`, and `high`, plus text input/output modality. The display names, default reasoning effort, and priority ordering are Codex-local catalog choices. ## Test Plan - Manually verified app-server model listing with an AWS profile: ```shell CODEX_HOME="$(mktemp -d)" cargo run -p codex-app-server-test-client -- \ --codex-bin ./target/debug/codex \ -c 'model_provider="amazon-bedrock"' \ -c 'model_providers.amazon-bedrock.aws.profile="codex-bedrock"' \ -c 'model_providers.amazon-bedrock.aws.region="us-west-2"' \ model-list ``` The response returned the Bedrock catalog with `openai.gpt-oss-120b-1:0` as the default model and `openai.gpt-oss-20b-1:0` as the second listed model, both text-only and supporting low/medium/high reasoning effort.