plan(slice-1): SD-0001 walking-skeleton implementation plan
Just-in-time plan for SLICE-1 (§7.2): backend 4-layer scaffold + import-linter, dev Postgres compose, psycopg migration runner + migration 0001, /healthz, scripts/check.sh + dev.sh, Vite/React shell, CI, docs/BOOTSTRAP.md. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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