feat(adapters): external adapter plugin system with dynamic UI parser

- Plugin loader: install/reload/remove/reinstall external adapters
  from npm packages or local directories
- Plugin store persisted at ~/.paperclip/adapter-plugins.json
- Self-healing UI parser resolution with version caching
- UI: Adapter Manager page, dynamic loader, display registry
  with humanized names for unknown adapter types
- Dev watch: exclude adapter-plugins dir from tsx watcher
  to prevent mid-request server restarts during reinstall
- All consumer fallbacks use getAdapterLabel() for consistent display
- AdapterTypeDropdown uses controlled open state for proper close behavior
- Remove hermes-local from built-in UI (externalized to plugin)
- Add docs for external adapters and UI parser contract

packages/plugins/sdk/src/testing.ts

@@ -405,7 +405,7 @@ export function createTestHarness(options: TestHarnessOptions): TestHarness {
         if (!isInCompany(issues.get(issueId), companyId)) return [];
         return issueComments.get(issueId) ?? [];
       },
-      async createComment(issueId, body, companyId) {
+      async createComment(issueId, body, companyId, options) {
         requireCapability(manifest, capabilitySet, "issue.comments.create");
         const parentIssue = issues.get(issueId);
         if (!isInCompany(parentIssue, companyId)) {
@@ -416,7 +416,7 @@ export function createTestHarness(options: TestHarnessOptions): TestHarness {
           id: randomUUID(),
           companyId: parentIssue.companyId,
           issueId,
-          authorAgentId: null,
+          authorAgentId: options?.authorAgentId ?? null,
           authorUserId: null,
           body,
           createdAt: now,