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feat(M3-003): OpenAI provider adapter for Codex gpt-5.4 #310

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jason.woltje merged 1 commits from feat/m3-openai-adapter into main 2026-03-21 21:35:44 +00:00
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jason.woltjeandClaude Sonnet 4.6 9b4d03cf30 feat(M3-003): implement OpenAI provider adapter for Codex gpt-5.4
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Adds OpenAIAdapter implementing IProviderAdapter, replacing the legacy
registerOpenAIProvider() inline registration in ProviderService.

- Creates apps/gateway/src/agent/adapters/openai.adapter.ts with:
  - register(): initialises OpenAI client, registers codex-gpt-5-4 with
    Pi ModelRegistry using openai-completions API; skips gracefully when
    OPENAI_API_KEY is absent
  - listModels(): returns Codex gpt-5.4 ModelInfo (128k context, tools+vision)
  - healthCheck(): lightweight GET /v1/models to verify API key validity
  - createCompletion(): streaming completions via openai SDK
    chat.completions.create({ stream: true }); maps chunks to CompletionEvent
- Installs openai SDK (^6.32.0) as a dependency in apps/gateway
- Registers OpenAIAdapter in ProviderService alongside OllamaAdapter
- Removes legacy registerOpenAIProvider() private method from ProviderService

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
 2026-03-21 16:35:20 -05:00