merge: wave 2 executor (01-02) into main

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

paperclip-reference/cli/src/adapters/http/format-event.ts

@@ -0,0 +1,4 @@
+export function printHttpStdoutEvent(raw: string, _debug: boolean): void {
+  const line = raw.trim();
+  if (line) console.log(line);
+}