fix(cliproxyapi): probe /v1/models for health (CPA 6.x has no /health) (#2189)

Integrated into release/v3.8.0 after syncing the contributor branch and validating tests/unit/cliproxyapi-executor.test.ts locally.

open-sse/executors/cliproxyapi.ts

@@ -344,11 +344,18 @@ export class CliproxyapiExecutor extends BaseExecutor {
 
   /**
    * Health check — verifies CLIProxyAPI is reachable.
+   *
+   * CPA 6.x doesn't expose a /health endpoint; previously we hit /health
+   * and got 404, which made the dashboard report "CLIProxyAPI not
+   * detected" even when the service was up and successfully serving
+   * /v1/messages. Probe /v1/models instead (returns 200 with the
+   * advertised model list), which is the closest thing CPA has to a
+   * liveness probe and works on every CPA version we've tested.
    */
   async healthCheck(): Promise<{ ok: boolean; latencyMs: number; error?: string }> {
     const start = Date.now();
     try {
-      const res = await fetch(`${this.upstreamBaseUrl}/health`, {
+      const res = await fetch(`${this.upstreamBaseUrl}/v1/models`, {
         signal: AbortSignal.timeout(HEALTH_CHECK_TIMEOUT_MS),
       });
       return {

tests/unit/cliproxyapi-executor.test.ts

@@ -296,6 +296,27 @@ describe("CliproxyapiExecutor", () => {
     });
   });
 
+  describe("healthCheck", () => {
+    it("probes /v1/models instead of /health", async () => {
+      process.env.CLIPROXYAPI_HOST = "127.0.0.1";
+      process.env.CLIPROXYAPI_PORT = "8317";
+
+      let capturedUrl;
+      globalThis.fetch = async (url) => {
+        capturedUrl = String(url);
+        return new Response(JSON.stringify({ data: [] }), { status: 200 });
+      };
+
+      const exec = new CliproxyapiExecutor();
+      const result = await exec.healthCheck();
+
+      assert.equal(capturedUrl, "http://127.0.0.1:8317/v1/models");
+      assert.equal(result.ok, true);
+      assert.equal(result.error, undefined);
+      assert.ok(result.latencyMs >= 0);
+    });
+  });
+
   describe("Anthropic-shape detection", () => {
     it("detects Anthropic-shape when top-level system field present", () => {
       const exec = new CliproxyapiExecutor();