Add 7 missing SDK methods and document all exports

- Add listAgents, unfreezeAgent, deleteAgent, getMe, issueApiToken, downloadExport, health methods
- Add corresponding response types to types.ts
- Export new types from index.ts
- Document all previously undocumented exports in README

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

src/index.ts

@@ -46,6 +46,9 @@ export type {
   RegisterAgentRequest,
   RegisterAgentResponse,
   GetAgentResponse,
+  ListAgentsResponse,
+  UnfreezeAgentResponse,
+  DeleteAgentResponse,
   SubmitOperationResponse,
   GetOperationResponse,
   VerifyOperationResponse,
@@ -57,8 +60,11 @@ export type {
   CreateExportResponse,
   GetExportResponse,
   ListExportsResponse,
+  GetMeResponse,
+  IssueApiTokenResponse,
   JWK,
   JWKSResponse,
+  HealthResponse,
   AuthRegisterResponse,
   AuthLoginResponse,
   ErrorResponse,