Add adapter environment testing infrastructure

Introduce testEnvironment() on ServerAdapterModule with structured
pass/warn/fail diagnostics for all four adapter types (claude_local,
codex_local, process, http). Adds POST test-environment endpoint,
shared types/validators, adapter test implementations, and UI API
client. Includes asset type foundations used by related features.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/routes/agents.ts

@@ -7,6 +7,7 @@ import {
   createAgentHireSchema,
   createAgentSchema,
   resetAgentSessionSchema,
+  testAdapterEnvironmentSchema,
   updateAgentPermissionsSchema,
   wakeAgentSchema,
   updateAgentSchema,
@@ -23,7 +24,7 @@ import {
 } from "../services/index.js";
 import { forbidden } from "../errors.js";
 import { assertBoard, assertCompanyAccess, getActorInfo } from "./authz.js";
-import { listAdapterModels } from "../adapters/index.js";
+import { findServerAdapter, listAdapterModels } from "../adapters/index.js";
 import { redactEventPayload } from "../redaction.js";
 
 export function agentRoutes(db: Db) {
@@ -195,6 +196,42 @@ export function agentRoutes(db: Db) {
     res.json(models);
   });
 
+  router.post(
+    "/companies/:companyId/adapters/:type/test-environment",
+    validate(testAdapterEnvironmentSchema),
+    async (req, res) => {
+      const companyId = req.params.companyId as string;
+      const type = req.params.type as string;
+      await assertCanReadConfigurations(req, companyId);
+
+      const adapter = findServerAdapter(type);
+      if (!adapter) {
+        res.status(404).json({ error: `Unknown adapter type: ${type}` });
+        return;
+      }
+
+      const inputAdapterConfig =
+        (req.body?.adapterConfig ?? {}) as Record<string, unknown>;
+      const normalizedAdapterConfig = await secretsSvc.normalizeAdapterConfigForPersistence(
+        companyId,
+        inputAdapterConfig,
+        { strictMode: strictSecretsMode },
+      );
+      const runtimeAdapterConfig = await secretsSvc.resolveAdapterConfigForRuntime(
+        companyId,
+        normalizedAdapterConfig,
+      );
+
+      const result = await adapter.testEnvironment({
+        companyId,
+        adapterType: type,
+        config: runtimeAdapterConfig,
+      });
+
+      res.json(result);
+    },
+  );
+
   router.get("/companies/:companyId/agents", async (req, res) => {
     const companyId = req.params.companyId as string;
     assertCompanyAccess(req, companyId);