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

server/src/services/heartbeat-run-summary.ts

@@ -7,6 +7,12 @@ function readNumericField(record: Record<string, unknown>, key: string) {
   return key in record ? record[key] ?? null : undefined;
 }
 
+function readCommentText(value: unknown) {
+  if (typeof value !== "string") return null;
+  const trimmed = value.trim();
+  return trimmed.length > 0 ? trimmed : null;
+}
+
 export function summarizeHeartbeatRunResultJson(
   resultJson: Record<string, unknown> | null | undefined,
 ): Record<string, unknown> | null {
@@ -33,3 +39,18 @@ export function summarizeHeartbeatRunResultJson(
 
   return Object.keys(summary).length > 0 ? summary : null;
 }
+
+export function buildHeartbeatRunIssueComment(
+  resultJson: Record<string, unknown> | null | undefined,
+): string | null {
+  if (!resultJson || typeof resultJson !== "object" || Array.isArray(resultJson)) {
+    return null;
+  }
+
+  return (
+    readCommentText(resultJson.summary)
+    ?? readCommentText(resultJson.result)
+    ?? readCommentText(resultJson.message)
+    ?? null
+  );
+}