Refactor pipeline policies, MCP registry, and unified config/runtime

tests/mcp-registry.test.ts

@@ -0,0 +1,65 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import {
+  McpRegistry,
+  createDefaultMcpRegistry,
+  createMcpHandlerShell,
+} from "../src/mcp/handlers.js";
+
+test("mcp registries are isolated instances", () => {
+  const registryA = createDefaultMcpRegistry();
+  const registryB = createDefaultMcpRegistry();
+
+  registryA.register(
+    createMcpHandlerShell({
+      id: "custom-a",
+      description: "custom handler",
+      matches: () => false,
+    }),
+  );
+
+  assert.equal(registryA.listHandlers().some((handler) => handler.id === "custom-a"), true);
+  assert.equal(registryB.listHandlers().some((handler) => handler.id === "custom-a"), false);
+});
+
+test("mcp registry resolves generic fallback by default", () => {
+  const registry = createDefaultMcpRegistry();
+
+  const resolved = registry.resolveServerWithHandler({
+    serverName: "local-files",
+    server: {
+      type: "stdio",
+      command: "npx",
+      args: ["-y", "@modelcontextprotocol/server-filesystem", "."],
+    },
+    context: {},
+    fullConfig: {
+      servers: {},
+    },
+  });
+
+  assert.equal(resolved.handlerId, "generic");
+  assert.ok(resolved.codex);
+  assert.ok(resolved.claude);
+});
+
+test("mcp registry rejects unknown explicit handlers", () => {
+  const registry = new McpRegistry();
+
+  assert.throws(
+    () =>
+      registry.resolveServerWithHandler({
+        serverName: "broken",
+        server: {
+          type: "http",
+          url: "http://localhost:3000/mcp",
+          handler: "missing-handler",
+        },
+        context: {},
+        fullConfig: {
+          servers: {},
+        },
+      }),
+    /Unknown MCP handler/,
+  );
+});