docs: close doc-gaps (hub v0.11.0, onlyoffice:nextcloud occ internals, metricsDBPath verified)

- 05-hub-architecture.md: stale 'felhom-hub v0.6.3' -> v0.11.0 (design-draft note).
- auth-hub-sync-integrations.md: full onlyoffice:nextcloud occ command sequence.
- storage-monitoring-metrics.md: metricsDBPath verified to coincide with the volume-backed
  data_dir on the bootstrap guest (persists; hardcoding is latent fragility only).
- REORG-NOTES: gaps 2/3 CLOSED, gap 5 partially closed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

documentation/architecture/05-hub-architecture.md

@@ -4,9 +4,11 @@
 > felhom-hub source** (`felhom.eu` repo, `hub/`) + Parts 01–04, then placed at
 > `docs/architecture/05-hub-architecture.md`.
 >
-> The hub is **not** greenfield — it's a mature service (felhom-hub v0.6.3, Go + SQLite on k3s,
-> `hub.felhom.eu`). This doc is the **deltas** to evolve it for the Proxmox model, plus the new
-> data model. Builds on Part 1 (trust/enrollment), Part 3 (the agent + reconcile), Part 4 (signing).
+> The hub is **not** greenfield — it's a mature service (felhom-hub **v0.11.0** as of 2026-06-13, Go +
+> SQLite on k3s, `hub.felhom.eu`). This doc is the **deltas** to evolve it for the Proxmox model, plus
+> the new data model. Builds on Part 1 (trust/enrollment), Part 3 (the agent + reconcile), Part 4 (signing).
+> NOTE: this remains a design-draft for the deltas; the live hub is v0.11.0 (the prior "v0.6.3" reference
+> was stale). Ground specifics against `felhom.eu/hub/` before relying on them.
 
 ## 1. Source-of-truth model — two drivers, two directions