Three nits identified during post-merge review of #1119, #1133:
1. ContextMenu.tsx imported `removeNode` from the canvas store but
stopped using it when the delete-confirm flow moved to Canvas in
#1133. Also removed the now-unused mock entry in the keyboard
test so the test inventory matches the real call list.
2. Preflight's YAML parse failure was a silent pass — defensible since
the in-container preflight owns the schema, but invisible to ops if
a template ships malformed YAML. Log at WARN so the signal surfaces
without blocking the provision.
3. formatMissingEnvError rendered its slice via %q, producing
`["A" "B"]` which is Go-literal-looking and ugly in a user-facing
error. Join with ", " instead. Test updated to assert the new
format.
No behavioural changes beyond the log line; fixes are review nits, not
bug fixes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>