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

ui/src/components/transcript/RunTranscriptView.test.tsx

@@ -81,4 +81,33 @@ describe("RunTranscriptView", () => {
       text: "Working on the task.",
     });
   });
+
+  it("renders successful result summaries as markdown in nice mode", () => {
+    const html = renderToStaticMarkup(
+      <ThemeProvider>
+        <RunTranscriptView
+          density="compact"
+          entries={[
+            {
+              kind: "result",
+              ts: "2026-03-12T00:00:02.000Z",
+              text: "## Summary\n\n- fixed deploy config\n- posted issue update",
+              inputTokens: 10,
+              outputTokens: 20,
+              cachedTokens: 0,
+              costUsd: 0,
+              subtype: "success",
+              isError: false,
+              errors: [],
+            },
+          ]}
+        />
+      </ThemeProvider>,
+    );
+
+    expect(html).toContain("<h2>Summary</h2>");
+    expect(html).toContain("<li>fixed deploy config</li>");
+    expect(html).toContain("<li>posted issue update</li>");
+    expect(html).not.toContain("result");
+  });
 });

ui/src/components/transcript/RunTranscriptView.tsx

@@ -491,6 +491,10 @@ export function normalizeTranscript(entries: TranscriptEntry[], streaming: boole
         label: "result",
         tone: entry.isError ? "error" : "info",
         text: entry.text.trim() || entry.errors[0] || (entry.isError ? "Run failed" : "Completed"),
+        detail:
+          !entry.isError && entry.text.trim().length > 0
+            ? `${formatTokens(entry.inputTokens)} / ${formatTokens(entry.outputTokens)} / $${entry.costUsd.toFixed(6)}`
+            : undefined,
       });
       continue;
     }
@@ -1062,9 +1066,14 @@ function TranscriptEventRow({
         )}
         <div className="min-w-0 flex-1">
           {block.label === "result" && block.tone !== "error" ? (
-            <div className={cn("whitespace-pre-wrap break-words text-sky-700 dark:text-sky-300", compact ? "text-[11px]" : "text-xs")}>
+            <MarkdownBody
+              className={cn(
+                "[&>*:first-child]:mt-0 [&>*:last-child]:mb-0 text-sky-700 dark:text-sky-300",
+                compact ? "text-[11px] leading-5" : "text-xs leading-5",
+              )}
+            >
               {block.text}
-            </div>
+            </MarkdownBody>
           ) : (
             <div className={cn("whitespace-pre-wrap break-words", compact ? "text-[11px]" : "text-xs")}>
               <span className="text-[10px] font-semibold uppercase tracking-[0.1em] text-muted-foreground/70">