PR: https://git.cafe/pingdotgg/t3code/pulls/16618
GitHub: https://github.com/pingdotgg/t3code/pull/16618
Head: 6ced418240b1992ac01131b944abfa0610857ae2
Main: 575579d68a

MAIN (separate /home/user/main worktree, vp i)
vp run dev (background; server 16733, web 8693)
Created /home/user/relay-verification project through web UI.
t3 thread start --base-dir /home/user/main/.t3 --provider codex --model gpt-6.1-sol --wait /home/user/relay-verification 'Reply exactly RELAY_VERIFICATION_OK. Do not modify files.'
Output: RELAY_VERIFICATION_OK
Stopped captured main process group before each restart.
T3CODE_BACKGROUND_RELAY_URL=https://relay.t3.codes vp run dev (background; no background environment credential)
Output: Listening on http://127.0.0.1:16733
curl http://localhost:8693/: HTTP 200
Main accepts/ignores the incomplete background override.

PR HEAD (vp i; one background dev server at a time)
T3CODE_BACKGROUND_RELAY_URL=https://relay.t3.codes vp run dev --home-dir /home/user/t3code/.t3 (no background environment credential)
Output: BackgroundRelayConfigInvalid: Configure T3CODE_BACKGROUND_RELAY_URL and T3CODE_BACKGROUND_RELAY_ENVIRONMENT_CREDENTIAL together, using an HTTPS origin and a nonempty credential. The optional T3CODE_BACKGROUND_RELAY_ISSUER must also be an HTTPS origin.
No server listening on port 13773. Vite remained running; stopped captured process group.
vp run dev --home-dir /home/user/t3code/.t3-verify --no-seed (background, fresh database)
Output: Listening on http://127.0.0.1:13773; web 5733.
Playwright 1.60.0 + /usr/bin/google-chrome:
Created project via Add project > Local folder > /home/user/relay-verification > Add.
Selected GPT-6.1-Sol, typed 'Reply exactly RELAY_VERIFICATION_OK. Do not modify files.', clicked Submit message.
Observed assistant reply RELAY_VERIFICATION_OK and thread Done.

With public configuration identifiers from .env.example, no login credentials:
t3 connect publish --base-dir /home/user/t3code/.t3-verify
Output: Publishing agent activity enabled.
Output: Run `t3 connect login` first so this environment can be authorized to publish.
t3 connect publish --disable --base-dir /home/user/t3code/.t3-verify
Output: Publishing agent activity disabled.

BLACKSMITH (remote testbox, after vp i)
vp test run apps/server/src/relay/BackgroundRelayConfig.test.ts apps/server/src/relay/AgentAwarenessRelay.test.ts packages/client-runtime/src/relay/managedRelay.test.ts apps/mobile/src/features/cloud/publicConfig.test.ts apps/mobile/src/features/cloud/managedRelayLayer.test.ts apps/mobile/src/features/agent-awareness/remoteRegistration.test.ts
6 test files passed; 55 tests passed.

LIMITS
No provisioned secondary relay credential, linked Clerk identity, or mobile client available.
Successful background publication, separate-token routing/reset, device registration, APNs notifications, and Live Activities are not verified end to end.
No mocks, fixtures, collector relay, or source modifications used.
Passing tests and a normal provider turn do not establish successful split relay delivery.