Fix stale model references in AI tests after model regeneration

- Update GitHub Copilot tests to use available models (claude-haiku-4.5, gemini-2.5-pro)
- Update OpenRouter tests to use available models (google/gemini-2.5-flash, deepseek/deepseek-chat)
- Fix over-broad sed that incorrectly renamed OpenAI Responses gpt-4o test
- Remove nvidia.md from repo root
- Update packages/ai/CHANGELOG.md

packages/ai/test/tool-call-without-result.test.ts

@@ -297,10 +297,10 @@ describe("Tool Call Without Result Tests", () => {
 
 	describe("GitHub Copilot Provider", () => {
 		it.skipIf(!githubCopilotToken)(
-			"gpt-4o - should filter out tool calls without corresponding tool results",
+			"claude-haiku-4.5 - should filter out tool calls without corresponding tool results",
 			{ retry: 3, timeout: 30000 },
 			async () => {
-				const model = getModel("github-copilot", "gpt-4o");
+				const model = getModel("github-copilot", "claude-haiku-4.5");
 				await testToolCallWithoutResult(model, { apiKey: githubCopilotToken });
 			},
 		);