feat(cli,core): add opt-in dev-only telnet log streaming (#4110)

Stream dev logs over a local telnet/TCP socket. `trigger dev` mirrors
its terminal output on port 6767 by default (override with
--telnet-logs-port or TRIGGER_DEV_TELNET_LOGS_PORT, 0 disables). webapp,
supervisor, and coordinator each expose an opt-in stream gated on a
per-service *_TELNET_LOGS_PORT env var. New
@trigger.dev/core/v3/telnetLogServer module (localhost-only,
backpressure-safe, plain-text) plus optional static Logger.onLog /
SimpleStructuredLogger.onLog sinks.

Then you (or your agent) can use `nc` to connect and filter out the
stream.
<img width="1103" height="239" alt="image"
src="https://github.com/user-attachments/assets/b4d47efc-8a57-4185-a159-10f2806627ae"
/>

.env.example

@@ -8,6 +8,8 @@ DATABASE_URL=postgresql://postgres:postgres@localhost:5432/postgres?schema=publi
 # See: https://www.prisma.io/docs/reference/api-reference/prisma-schema-reference#fields:~:text=the%20shadow%20database.-,directUrl,-No
 DIRECT_URL=${DATABASE_URL}
 REMIX_APP_PORT=3030
+# Dev-only: stream the webapp's logs over a local telnet/TCP socket (nc localhost 6767). Uncomment to enable.
+# WEBAPP_TELNET_LOGS_PORT=6767
 APP_ENV=development
 APP_ORIGIN=http://localhost:3030
 ELECTRIC_ORIGIN=http://localhost:3060