refactor(open-sse): translator DRY + schema enums, bug fixes, dead code cleanup

- Bug B1-B7: media UI m.kind||m.type, serviceKinds, gemini mediaPriority, schema kind, models/info lookup by kind
- Dead code D1-D6: safeParseJSON, drop PROVIDER_ENDPOINTS, orphan fetcher, GITHUB_CONFIG derive, getProviderConfig internal, legacy kiro file
- Translator concerns: toOpenAIUsage, toOpenAIFinish (gemini/kiro/ollama + fix kiro tool finish), thinking effort maps
- Reorg helpers/ → concerns/ (logic) + formats/ (per-format) + schema/ (pure enums: roles/blocks/finishReasons/defaults)
- Wire ~280 hardcoded role/block/finish/default literals to schema enums across 20+ files
- collapseTextParts + extractTextContent dedup
- Normalize translator fn names to openaiToXRequest / xToOpenAIResponse
- Golden tests lock behavior; 0 regression (byte-for-byte providers/alias, 26=26 known fails)

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/executors/commandcode.js

@@ -1,7 +1,7 @@
 import { randomUUID } from "crypto";
 import { BaseExecutor } from "./base.js";
 import { PROVIDERS } from "../config/providers.js";
-import { convertCommandCodeToOpenAI } from "../translator/response/commandcode-to-openai.js";
+import { commandCodeToOpenAIResponse } from "../translator/response/commandcode-to-openai.js";
 import { SSE_DONE } from "../utils/sseConstants.js";
 
 /**
@@ -71,13 +71,13 @@ function wrapNdjsonAsOpenAISse(originalResponse, model) {
         const trimmed = line.trim();
         if (!trimmed) continue;
         // Translate AI SDK v5 NDJSON line to one or more OpenAI chunks
-        emitChunks(convertCommandCodeToOpenAI(trimmed, state), controller);
+        emitChunks(commandCodeToOpenAIResponse(trimmed, state), controller);
       }
     },
     flush(controller) {
       const trimmed = buffer.trim();
       if (trimmed) {
-        emitChunks(convertCommandCodeToOpenAI(trimmed, state), controller);
+        emitChunks(commandCodeToOpenAIResponse(trimmed, state), controller);
       }
       controller.enqueue(encoder.encode(SSE_DONE));
     },