AFTER — real T3 server CLI reproduction
Commit: a083b0bf7e7d1dbffbcf8623ff19a3191d43838c
Environment: Linux, Node server from source; fresh isolated T3 home; no seed data.
Tailscale: deterministic CLI stub (Running backend, empty serve status).
Command: T3CODE_DEV_SEED=0 node apps/server/src/bin.ts serve --base-dir <isolated-home> --host 127.0.0.2 --port 45679 --tailscale-serve --tailscale-serve-port 8443

Observed Tailscale Serve argv: ["serve", "--bg", "--https=8443", "http://127.0.0.2:45679"]
Observed listening socket (ss -H -ltn): LISTEN 0      511    127.0.0.2:45679 0.0.0.0:*
Direct bound address: HTTP 200
Default loopback address: <urlopen error [Errno 111] Connection refused>
Configured Serve target http://127.0.0.2:45679: HTTP 200

Endpoint requested: /.well-known/t3/environment
AI-assisted; verified with the tests and tools listed above.