Records the reversal of the earlier "migrate to Hetzner Object Storage"
direction in docs/infrastructure/production-compose.md. Documents the
cost/benefit (current 13 GB fits trivially on the VPS; OBS billing is
dominated by base fee at this size; migration is a three-env-var swap
plus `mc mirror`, no application rewrite cost).
Captures the four triggers that should re-open the decision (50 GB
threshold, healthcheck latency, VPS upgrade cost, backup runtime) so
the deferral does not become an indefinite punt.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
