http.Client.Do only errors on transport failure — a CP 5xx (AWS
hiccup, missing IAM, transient outage) was silently treated as
success. Workspace row then flipped to status='removed' and the EC2
stayed alive forever with no DB pointer (the "orphan EC2 on a
0-customer account" scenario flagged in workspace_crud.go #1843).
Found while triaging 13 zombie workspace EC2s on demo-prep staging.
Adds a status-code check that returns an error tagged with the
workspace ID + status + bounded body excerpt, so the existing
loud-fail path in workspace_crud.go's Delete handler can populate
stop_failures and surface a 500. Body read is io.LimitReader-capped
at 512 bytes to keep error logs sane during a CP outage.
Tests: 4 new (5xx surfaces, 4xx surfaces, 2xx variants 200/202/204
all succeed, long body is truncated). Test-first verified — the
first three fail on the buggy code and all four pass on the fix.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>