feat: Add Kilo Gateway provider (#20212)

* feat: Add Kilo Gateway provider

Add support for Kilo Gateway as a model provider, similar to OpenRouter.
Kilo Gateway provides a unified API that routes requests to many models
behind a single endpoint and API key.

Changes:
- Add kilocode provider option to auth-choice and onboarding flows
- Add KILOCODE_API_KEY environment variable support
- Add kilocode/ model prefix handling in model-auth and extra-params
- Add provider documentation in docs/providers/kilocode.md
- Update model-providers.md with Kilo Gateway section
- Add design doc for the integration

* kilocode: add provider tests and normalize onboard auth-choice registration

* kilocode: register in resolveImplicitProviders so models appear in provider filter

* kilocode: update base URL from /api/openrouter/ to /api/gateway/

* docs: fix formatting in kilocode docs

* fix: address PR review — remove kilocode from cacheRetention, fix stale model refs and CLI name in docs, fix TS2742

* docs: fix stale refs in design doc — Moltbot to OpenClaw, MoltbotConfig to OpenClawConfig, remove extra-params section, fix doc path

* fix: use resolveAgentModelPrimaryValue for AgentModelConfig union type

---------

Co-authored-by: Mark IJbema <mark@kilocode.ai>

src/agents/pi-embedded-runner/cache-ttl.ts

@@ -29,6 +29,9 @@ export function isCacheTtlEligibleProvider(provider: string, modelId: string): b
   if (normalizedProvider === "openrouter" && isOpenRouterCacheTtlModel(normalizedModelId)) {
     return true;
   }
+  if (normalizedProvider === "kilocode" && normalizedModelId.startsWith("anthropic/")) {
+    return true;
+  }
   return false;
 }
 

src/agents/pi-embedded-runner/kilocode.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, it } from "vitest";
+import { isCacheTtlEligibleProvider } from "./cache-ttl.js";
+
+describe("kilocode cache-ttl eligibility", () => {
+  it("is eligible when model starts with anthropic/", () => {
+    expect(isCacheTtlEligibleProvider("kilocode", "anthropic/claude-opus-4.6")).toBe(true);
+  });
+
+  it("is eligible with other anthropic models", () => {
+    expect(isCacheTtlEligibleProvider("kilocode", "anthropic/claude-sonnet-4")).toBe(true);
+  });
+
+  it("is not eligible for non-anthropic models on kilocode", () => {
+    expect(isCacheTtlEligibleProvider("kilocode", "openai/gpt-5")).toBe(false);
+  });
+
+  it("is case-insensitive for provider name", () => {
+    expect(isCacheTtlEligibleProvider("Kilocode", "anthropic/claude-opus-4.6")).toBe(true);
+    expect(isCacheTtlEligibleProvider("KILOCODE", "Anthropic/claude-opus-4.6")).toBe(true);
+  });
+});