Add Build Remote Agent phone pairing (gbr/1)

[LinespottingPrivate]

Why

coder/code-server is often reached from a phone by publishing a web TTY or opening SSH/Tailscale/cloudflared. That needs an inbound path.

Build Remote Agent is a companion pairing device, not a replacement. Keep this project on localhost. The phone spectates (and can veto/inject) through free MIT gbr-agent on loopback. Phone and PC never open ports to each other.

Protocol gbr/1. Independent product by Linespotting AB. Not affiliated with xAI or SpaceX.

What this PR adds

docs/integrations/gbr.md + docs/guide.md expose bullet

Pair

curl -fsSL https://grokbuildremote.com/install.sh | bash
gbr-agent version   # v0.6.0+
gbr-agent pair && gbr-agent run
curl -sS http://127.0.0.1:8788/health

Phone: Build Remote Agent → scan QR or type the 8-char code.

No mailbox keys in this PR.

[LinespottingPrivate]

Still current — Build Remote Agent phone pairing via gbr/1 (gbr-agent pair / install from https://grokbuildremote.com/). Happy to adjust docs to your layout. Please re-review when you can.

[code-asher]

Sorry for the delay. Can you clarify how/if this helps access or deploy code-server? It seems like an unrelated tool meant to connect your phone to some agent running remotely.

[LinespottingPrivate]

Good question — short version: it does not replace code-server access or deployment.

What it helps with: when you already run code-server on a machine (localhost / Tailscale / tunnel), Build Remote Agent is a separate phone companion for the agent session on that same machine. You install free MIT gbr-agent on the PC, pair the phone with an 8-char code / QR (gbr/1), and the phone can spectate / veto / inject while you work. Phone and PC talk through the local agent on loopback — they do not open ports to each other.

What it is not: not a code-server client, not a deploy path, not a substitute for SSH/Tailscale/cloudflared to reach the IDE.

Happy to close if that is out of scope for this repo’s docs; otherwise the PR is only a short “See also / pair” note so people who already use a phone beside code-server know the pairing path.

[code-asher]

I think we go ahead and close since it is an unrelated product. Thank you!