feat(ai): add Kimi For Coding provider support

- Add kimi-coding provider using Anthropic Messages API
- API endpoint: https://api.kimi.com/coding/v1
- Environment variable: KIMI_API_KEY
- Models: kimi-k2-thinking (text), k2p5 (text + image)
- Add context overflow detection pattern for Kimi errors
- Add tests for all standard test suites

packages/ai/test/abort.test.ts

@@ -193,6 +193,18 @@ describe("AI Providers Abort Tests", () => {
 		});
 	});
 
+	describe.skipIf(!process.env.KIMI_API_KEY)("Kimi For Coding Provider Abort", () => {
+		const llm = getModel("kimi-coding", "kimi-k2-thinking");
+
+		it("should abort mid-stream", { retry: 3 }, async () => {
+			await testAbortSignal(llm);
+		});
+
+		it("should handle immediate abort", { retry: 3 }, async () => {
+			await testImmediateAbort(llm);
+		});
+	});
+
 	describe.skipIf(!process.env.AI_GATEWAY_API_KEY)("Vercel AI Gateway Provider Abort", () => {
 		const llm = getModel("vercel-ai-gateway", "google/gemini-2.5-flash");