ops(rackpeek): make inventory repo-owned

dev/rackpeek/README.md

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+# RackPeek source of truth
+
+This directory is the git-tracked RackPeek inventory for the homelab.
+
+## Files
+- `config.yaml` — current RackPeek v3 inventory assembled from the homelab docs
+
+## Data sources
+Update this inventory from the canonical repo docs first:
+- `docs/architecture/ARCHITECTURE_OVERVIEW.md`
+- `docs/architecture/SERVICES_DIRECTORY.md`
+- `docs/servers/PLAUSIBLEDENABILITY.md`
+- `docs/servers/SERENITY.md`
+- `docs/servers/NOMAD.md`
+- `docs/servers/ROCINANTE.md`
+
+## Runtime wiring
+The `dev/docker-compose.yaml` RackPeek service mounts this repo directory directly at `/app/config` on PD:
+- host path: `/mnt/docker-ssd/docker/compose/dev/rackpeek`
+- container path: `/app/config`
+
+Data protection keys remain outside git at:
+- `/mnt/tank/docker/appdata/app/rackpeek/dpkeys`
+
+## Validation
+From a repo checkout with Docker available:
+
+```bash
+docker run --rm \
+  -p 18283:8080 \
+  -e RPK_YAML_DIR=/app/config \
+  -v "$PWD/dev/rackpeek:/app/config" \
+  aptacode/rackpeek:latest
+```
+
+Then verify:
+
+```bash
+curl http://127.0.0.1:18283/health
+```
+
+Expected response: `rackpeek`