Relay 0.21.0

TL;DR: Comment on pages in the browser, run a deep review round from any thread, send as many images as you like, and Relay now counts its users (anonymously, and you can turn it off).

• Relay now counts its users. Once a day it tells ping.relaycode.io it's in use: its version, the system, and whether it's desktop or headless. No ID, and the address isn't kept. Turn it off with Count me as a user in Settings → About, relay settings on a headless Relay, or DO_NOT_TRACK=1.
• Comment on elements right in the browser preview. Your comments travel with the screenshot and survive pastes, copies and edits in the composer.
• Agents can start a deep review round in any thread, reviewing the folder that thread works in, with the thread's own agent leading. Each round keeps its own fixes and checkout.
• Deep review remembers the last base branch per project, and its card splits changed lines into code, tests, fixtures and docs like pull requests do.
• No more limit on how many images a message carries, on the desktop or the phones. Big sends from the phone go up in batches instead of failing.
• Folder paths in answers that sit outside the project open in Finder, Explorer or your file manager. Links to files outside the project now work on Windows too.
• Activity can hide thread branches, and a shelved thread shows its time on the branch line.
• Failed tool calls show in red in the trace.
• The phone gets notified after 10min without input instead of 2min, so reading a long answer no longer floods it. Locking or sleeping the computer still hands off at once.
• Claude and Codex can be steered with a $skill mid-turn.
• Switching agents right after a fork writes a proper handoff note again.
• The model picker keeps one height when switching tabs.