Merge origin/master into feat/remote-host-wake

Resolves CLAUDE.md count tables (route counts recounted on the merged
tree: 235 handlers, sessions 37) and keeps both the host-wake and the
reboot-restore banner in index.html.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QdGP4jUTjc9J2RYYykDrCG

test/mocks/mock-session.ts

@@ -68,6 +68,9 @@ export class MockSession extends EventEmitter {
     this.lastSubmitAt = Date.now();
   }
 
+  /** Mirrors Session.trackUserInput (the send-key route feeds it around the write path). */
+  trackUserInput(_data: string): void {}
+
   private _muxName: string | null = null;
 
   constructor(id: string = 'mock-session-id') {