fix: add CodeLayer firepass provider parity

[K-Mistele]

Summary

• Add Firepass/Fireworks support to CodeLayer provider resolution, including the Fireworks OpenAI-compatible chat endpoint and default router model.
• Add Anthropic and Fireworks auth-store fallbacks while preserving environment-variable precedence.
• Restore single-block assistant/thinking labels in the streaming output renderer for CLI parity.

Verification

• bun --filter @humanlayer/agentlayer-core typecheck
• bun --filter @humanlayer/codelayer typecheck
• bun --bun test --conditions=source agents/codelayer/test/agent.test.ts
• bun --conditions=source --bun agents/codelayer/src/cli.ts --provider firepass --prompt "Respond with exactly two lines: ok then done"

[github-actions]

Docs Agent Review

Based on my review of the documentation and the source diff, I've identified several gaps where the docs don't cover new functionality.

Verdict

The documentation has significant gaps regarding:

1. New firepass provider - The Fireworks AI provider (firepass) is not documented in the multi-model guide
2. GitHub Copilot provider - Available as a CLI provider but not listed in supported providers
3. Auth store for API keys - The new ability to store Anthropic and Fireworks API keys in the auth store (with env var fallback) is undocumented
4. OAuth field aliases - The AuthInfo decoder now accepts access/refresh/expires as aliases - undocumented behavioral change

Recommended Updates

1. Update guides/multi-model.md

Add firepass and copilot to the supported providers table, add their environment variables, and document the auth store fallback:

## Supported Providers

| Provider | Model Examples | Environment Variable |
|----------|---------------|---------------------|
| Anthropic | `claude-sonnet-4-20250514`, `claude-opus-4-20250514` | `ANTHROPIC_API_KEY` |
| OpenAI | `gpt-4o`, `gpt-4-turbo`, `o1-preview` | `OPENAI_API_KEY` |
| Google | `gemini-2.0-flash`, `gemini-1.5-pro` | `GOOGLE_API_KEY` |
| Fireworks (Firepass) | `accounts/fireworks/routers/kimi-k2p5-turbo` | `FIREWORKS_API_KEY` |
| GitHub Copilot | `gpt-5.4` | Via AgentLayer auth store |
| OpenAI Codex | `gpt-5.5` | Via AgentLayer auth store |

Add section on auth store fallback:

## Auth Store API Keys

For Anthropic and Fireworks, you can store API keys in the AgentLayer auth store instead of environment variables:

```ts
import { ensureFileAuthStore } from '@humanlayer/agentlayer-provider-auth'

const authStore = await ensureFileAuthStore()
await authStore.set('anthropic', { kind: 'api', apiKey: 'sk-ant-...' })
await authStore.set('fireworks', { kind: 'api', apiKey: 'fw-...' })

The provider resolution checks environment variables first, then falls back to the auth store.

### 2. Update `packages/openai-codex/index.md`
Document the OAuth field aliases in the auth store section:

```markdown
### OAuth Auth Info Fields

The auth store accepts these fields for OAuth tokens:

| Field | Aliases | Description |
|-------|---------|-------------|
| `accessToken` | `access` | The OAuth access token (required) |
| `refreshToken` | `refresh` | Refresh token for token rotation |
| `expiresAt` | `expires` | Unix timestamp when the token expires |
| `idToken` | — | OpenID Connect ID token |
| `scope` | — | Granted scopes |
| `tokenType` | — | Token type (e.g., `Bearer`) |

Files Worth Updating

File	Priority	Change Needed
packages/docs/content/guides/multi-model.md	High	Add Firepass/Copilot providers, document auth store API key fallback
packages/docs/content/packages/openai-codex/index.md	Medium	Document OAuth field aliases (access/refresh/expires)

The output-renderer.ts changes are internal formatting improvements that don't affect the public API surface documented in concepts/streaming.md, so no update is needed there.

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To apply these recommendations, comment: @docs-agent apply

[K-Mistele]

FIREPASS_MODEL_ID

[K-Mistele]

@docs-agent apply

[github-actions]

Docs Agent Apply

Applied markdown updates and validated the docs build.

• packages/docs/content/guides/multi-model.md
• packages/docs/content/packages/openai-codex/index.md