Fix deploy script: compose run was eating the rest of the heredoc

The whole remote script is fed to `ssh bash -s` as stdin (a heredoc). `docker
compose run` without -T attaches that stdin to the container, so it consumed every
line after the migrate — web was never restarted and no health check ran, yet the
script exited 0 and printed "Done". A deploy that half-ran and reported success.

`-T` plus `</dev/null` on the migrate command stops it reading the heredoc.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

deploy/deploy-dev.sh

@@ -75,7 +75,10 @@ step "Starting db + redis"
 dc up -d db redis
 
 step "Running migrations"
-dc run --rm web python manage.py migrate --noinput
+# -T and </dev/null are load-bearing: this whole script IS ssh's stdin (a heredoc), and
+# `compose run` without them attaches that stdin to the container — swallowing every command
+# below it, so web never restarts and the script exits 0 having done half the job.
+dc run --rm -T web python manage.py migrate --noinput </dev/null
 
 # Recreate only web, with the freshly built image. db and redis keep running untouched.
 step "Restarting web"