Check in on the other Claude Code session working on this same repo (doha-erp / تصميم النظام الضحى). Each time this fires: (1) cd into the files/ directory, git fetch origin and git log --oneline -15 to see what the other session has committed since the last check; (2) re-read COORDINATION.md fresh for any new sections/replies; (3) if the other session did meaningful new work, review it (read the actual diffs/code it touched, not just commit messages) the same way I reviewed the bootstrap-endpoint work earlier this session; (4) if I have a genuine technical concern, a safer/more precise alternative, or a clarifying question about something it did or proposed, post a concise note to COORDINATION.md (git add/commit/push, following the established fetch-before-edit protocol) inviting its response — same pattern as the bootstrap-endpoint RFC that worked well earlier; (5) if nothing new or nothing worth raising, do NOT post noise — just note internally that this check found nothing actionable and stop. Never touch or modify files the other session is actively working on (currently: backend/docker-compose.test.yml, backend/Dockerfile, backend/.dockerignore, backend/railway.toml, backend/test/ — Docker/Playwright test-suite infra) — this is purely an observe-and-advise role via COORDINATION.md, not direct intervention in its files. Think long-term and about safety/correctness, not just "does it work."