Add MinerOps changelog checkpoint

CHANGELOG.md

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+# MinerOps Changelog
+
+## Current working checkpoint
+
+### Core
+- MinerOps hub is running in CT 306.
+- Public URL: https://plexus.lussier.cc
+- Backend health, database, and Redis are working.
+- Windows Agent handles miner discovery, polling, pool snapshots, API3 enrichment, and controls.
+
+### Location map
+- Location map is working.
+- Repair miners can be returned to shelf from /repairs through /locations.
+- Empty shelf click-to-move was fixed to use real tile data instead of order-based matching.
+
+### Repair workflow
+- /repairs Repair Queue is working.
+- Search and filters work.
+- Repair statuses include Open, Diagnosing, Waiting Parts, In Progress, Testing, Ready to Shelf, Needs Follow-up, Completed, Failed, and Cancelled.
+- Status labels display cleanly.
+- Repair notes work.
+- Parts Used works with quantity.
+- Parts Summary card works.
+- Repair History modal works.
+- Repair History events can be edited or deleted.
+- CSV export works.
+- Move to Shelf works.
+
+### Dashboard
+- Dashboard Repair Summary card is working.
+- Repair Queue link works.
+
+### System health
+- /system-health page is working.
+- Shows app health, fleet state, repair state, table sizes, duplicate routes, patch markers, and retention summary.
+
+### Retention
+- Hourly and daily status rollup tables are created.
+- Manual rollup pass completed.
+- Nightly retention dry-run is scheduled.
+- Raw status snapshots are not being deleted yet.
+- Reminder is scheduled to verify dry-run and switch to apply mode if clean.
+
+### Git / Gitea
+- /opt/minerops is initialized as a Git repository.
+- Safe .gitignore is installed.
+- Repository pushed to Gitea:
+  https://gitea.lussier.cc/lussierj/minerops.git