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>

packages/adapter-utils/src/index.ts

@@ -5,6 +5,11 @@ export type {
   AdapterExecutionResult,
   AdapterInvocationMeta,
   AdapterExecutionContext,
+  AdapterEnvironmentCheckLevel,
+  AdapterEnvironmentCheck,
+  AdapterEnvironmentTestStatus,
+  AdapterEnvironmentTestResult,
+  AdapterEnvironmentTestContext,
   AdapterSessionCodec,
   AdapterModel,
   ServerAdapterModule,

packages/adapter-utils/src/types.ts

@@ -82,9 +82,35 @@ export interface AdapterModel {
   label: string;
 }
 
+export type AdapterEnvironmentCheckLevel = "info" | "warn" | "error";
+
+export interface AdapterEnvironmentCheck {
+  code: string;
+  level: AdapterEnvironmentCheckLevel;
+  message: string;
+  detail?: string | null;
+  hint?: string | null;
+}
+
+export type AdapterEnvironmentTestStatus = "pass" | "warn" | "fail";
+
+export interface AdapterEnvironmentTestResult {
+  adapterType: string;
+  status: AdapterEnvironmentTestStatus;
+  checks: AdapterEnvironmentCheck[];
+  testedAt: string;
+}
+
+export interface AdapterEnvironmentTestContext {
+  companyId: string;
+  adapterType: string;
+  config: Record<string, unknown>;
+}
+
 export interface ServerAdapterModule {
   type: string;
   execute(ctx: AdapterExecutionContext): Promise<AdapterExecutionResult>;
+  testEnvironment(ctx: AdapterEnvironmentTestContext): Promise<AdapterEnvironmentTestResult>;
   sessionCodec?: AdapterSessionCodec;
   supportsLocalAgentJwt?: boolean;
   models?: AdapterModel[];