hook up open-ai "responses" api (text). tools are still unimplemented as well as other media types

Author: sawka

.golangci.yml

@@ -0,0 +1,10 @@
+linters:
+    disable:
+        - unused
+        - unusedfunc
+        - unusedparams
+issues:
+    exclude-rules:
+        - linters:
+              - unused
+          text: "unused parameter"

aiprompts/openai-streaming-text.md

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+For **just text streaming**, you only need to handle these 3 core events:
+
+## Essential Events
+
+### 1. `response.created`
+
+```json
+{
+  "type": "response.created",
+  "response": {
+    "id": "resp_abc123",
+    "created_at": 1640995200,
+    "model": "gpt-5"
+  }
+}
+```
+
+**Purpose**: Initialize response tracking (like Anthropic's `message_start`)
+
+### 2. `response.output_text.delta`
+
+```json
+{
+  "type": "response.output_text.delta",
+  "item_id": "msg_abc123",
+  "delta": "Hello, how can I"
+}
+```
+
+**Purpose**: Stream text chunks (like Anthropic's `text_delta`)
+
+### 3. `response.completed`
+
+```json
+{
+  "type": "response.completed",
+  "response": {
+    "usage": {
+      "input_tokens": 100,
+      "output_tokens": 200
+    }
+  }
+}
+```
+
+**Purpose**: Finalize response (like Anthropic's `message_stop`)
+
+## Optional but Recommended
+
+### 4. `error`
+
+```json
+{
+  "type": "error",
+  "code": "rate_limit_exceeded",
+  "message": "Rate limit exceeded"
+}
+```
+
+**Purpose**: Handle errors gracefully
+
+---
+
+That's it for basic text streaming! You can ignore all the `response.output_item.added/done`, tool calling, reasoning, and annotation events if you just want simple text responses.
+
+Your Go implementation would be:
+
+1. Parse SSE stream
+2. Switch on `event.type`
+3. Handle these 4 event types
+4. Accumulate text from `delta` fields
+5. Emit to your existing SSE handler
+
+Much simpler than the full implementation.