feat(codex): add GPT-6 Sol and Luna support

- Add GPT-6 Sol and Luna to the Codex model registry.
- Send both models using the Codex 0.155 Responses Lite request shape, including `reasoning.context: "all_turns"`.

open-sse/providers/thinkingLevels.js

@@ -3,6 +3,7 @@
 import { getCapabilitiesForModel } from "./capabilities.js";
 import { matchPattern } from "./pricing.js";
 import { resolveKiroEffortPath } from "../config/kiroConstants.js";
+import { getProviderModels } from "../config/providerModels.js";
 
 // Shared level sets (deduped) — verified against provider docs + wire in thinkingUnified.applyFormat.
 const L = {
@@ -69,10 +70,14 @@ export function getThinkingLevels(provider, model) {
   if (provider === "kiro" && resolveKiroEffortPath(model) === null) return null;
   const caps = getCapabilitiesForModel(provider, model);
   if (!caps.reasoning) return null;
+  const baseId = String(model || "").replace(/\([^()]+\)\s*$/, "");
+  const modelLevels = provider === "codex"
+    ? getProviderModels("cx").find((entry) => entry.id === baseId)?.thinkingLevels
+    : null;
   const hit = PATTERN_THINKING.find((entry) =>
     (!entry.provider || entry.provider === provider) && matchPattern(entry.pattern, model)
   );
-  let levels = hit?.levels || FORMAT_LEVELS[caps.thinkingFormat] || L.base;
+  let levels = modelLevels || hit?.levels || FORMAT_LEVELS[caps.thinkingFormat] || L.base;
   if (caps.thinkingCanDisable === false) levels = levels.filter((l) => l !== "none");
   return levels;
 }