feat(coding-agent): merge origin/main into model runtime facade

packages/coding-agent/docs/providers.md

@@ -1,6 +1,6 @@
 # Providers
 
-Pi supports subscription-based providers via OAuth and API key providers via environment variables or auth file. For each provider, pi knows all available models. The list is updated with every pi release.
+Pi supports subscription-based providers via OAuth and API key providers via environment variables or auth file. Built-in catalogs ship with pi; configured providers may refresh newer catalogs and cache them in `~/.pi/agent/models-store.json` for offline use.
 
 ## Table of Contents
 
@@ -18,6 +18,7 @@ Use `/login` in interactive mode, then select a provider:
 - ChatGPT Plus/Pro (Codex)
 - Claude Pro/Max
 - GitHub Copilot
+- Radius
 
 Use `/logout` to clear credentials. Tokens are stored in `~/.pi/agent/auth.json` and auto-refresh when expired.
 
@@ -35,6 +36,10 @@ Anthropic subscription auth is active for Claude Pro/Max accounts. Third-party h
 - Press Enter for github.com, or enter your GitHub Enterprise Server domain
 - If you get "model not supported", enable it in VS Code: Copilot Chat → model selector → select model → "Enable"
 
+### Radius
+
+Radius is a dynamic `pi-messages` gateway. `/login radius` stores OAuth tokens in `auth.json`; the gateway catalog is refreshed independently and cached in `models-store.json`. Custom Radius gateways can be declared in `models.json` with `"oauth": "radius"` and a gateway `baseUrl`.
+
 ## API Keys
 
 ### Environment Variables or Auth File
@@ -55,6 +60,7 @@ pi
 | DeepSeek | `DEEPSEEK_API_KEY` | `deepseek` |
 | NVIDIA NIM | `NVIDIA_API_KEY` | `nvidia` |
 | Google Gemini | `GEMINI_API_KEY` | `google` |
+| Amazon Bedrock | `AWS_BEARER_TOKEN_BEDROCK` | `amazon-bedrock` |
 | Mistral | `MISTRAL_API_KEY` | `mistral` |
 | Groq | `GROQ_API_KEY` | `groq` |
 | Cerebras | `CEREBRAS_API_KEY` | `cerebras` |
@@ -67,6 +73,7 @@ pi
 | ZAI Coding Plan (China) | `ZAI_CODING_CN_API_KEY` | `zai-coding-cn` |
 | OpenCode Zen | `OPENCODE_API_KEY` | `opencode` |
 | OpenCode Go | `OPENCODE_API_KEY` | `opencode-go` |
+| Radius | `RADIUS_API_KEY` | `radius` |
 | Hugging Face | `HF_TOKEN` | `huggingface` |
 | Fireworks | `FIREWORKS_API_KEY` | `fireworks` |
 | Together AI | `TOGETHER_API_KEY` | `together` |
@@ -170,6 +177,8 @@ export AZURE_OPENAI_DEPLOYMENT_NAME_MAP=gpt-4=my-gpt4,gpt-4o=my-gpt4o
 
 ### Amazon Bedrock
 
+Use `/login amazon-bedrock` to store a Bedrock API key, or configure one of the ambient AWS credential sources below:
+
 ```bash
 # Option 1: AWS Profile
 export AWS_PROFILE=your-profile