Pin homelab-wide UNAS storage convention; add Phase 6 + info wishlist

- UNAS layout decoded from the user's tree: services/<svc>/ is the
  homelab-wide docker config store (every container follows the same
  pattern — immich, karakeep, nextcloud, ntfy, paperless-ai, pocketid,
  shelfmark, stremio, traccar, vaultwarden, gluetun). Nexa MUST follow
  the same pattern at services/nexa/. backup/<svc>/ for snapshots.
  Pinned in CLAUDE.md and docs/12 #31.
- Stale services flagged for retirement: services/siyuan/ (migrated to
  Obsidian) and services/open-webui/ (unused, only LobeHub is alive).
  Drops the "two LLM UIs" item (#15) — it's now "retire open-webui".
- Hard-blocklist for any Nexa indexer pinned in CLAUDE.md:
  _sortMe/wallet/**, *.gpg/asc/key/pem/kdbx/credentials/secret, plus
  the Nextcloud appdata dir.
- Three new "future user-facing wins" surfaced from the tree:
  Paperless-AI as a Phase-2.x triage helper for _sortMe/Downloads/,
  media/Recipes/ (~300 entries) as the showcase RAG corpus, and
  Paperless-AI's existing ChromaDB as a potential read-from source
  rather than re-embedding scanned docs.
- Housekeeping campaign in docs/12 §35-37: consolidate postgres,
  audit UNAS-everywhere, S3 archive tier on s3.nuclide.systems.
- Phase 6 added to the roadmap: "Nexa as homelab steward". Polls
  Dockge/docker/Proxmox, diffs vs documented state, emits a daily
  drift report. Most of the housekeeping campaign becomes
  semi-automatic once 6.1-6.3 ship.
- New docs/13-information-wishlist.md packages the still-needed
  inventory as 5-6 paste-and-run tasks, each with explicit "📍 Where"
  markers (which shell or which UI) and what it unblocks. Highest
  leverage = Task 1 (read an existing compose stack to lock Q19).
- docs/index.md TOC extended to 13 rows.

Also fixed numbering drift in docs/12 (duplicate #28, missing #17/#18)
and added Q19 to docs/11 covering the SMB-share verification step.

docs/02-roadmap.md

@@ -46,3 +46,15 @@ Iterative build-out, value-first. Each phase is shippable on its own.
 
 - [ ] **5.1 HA Voice** — Wake-word integration, Wyoming protocol.
 - [ ] **5.2 System monitoring** — Proxmox / Backrest alerts into the Memos system feed via ntfy.
+
+## Phase 6 — Nexa as homelab steward
+
+**Focus:** Nexa actively maintains the homelab inventory instead of being told manually.
+**Milestone:** Nexa runs a daily *drift report* — what changed, what's stale, what's missing — and turns it into actionable comments under a pinned `[STEWARD]` memo.
+
+- [ ] **6.1 Inventory sync** — Nexa polls Dockge / `docker ps` / Proxmox API on a schedule and stores the running-state snapshot in GraphDB (`nexa:Service`, `nexa:LastSeen`, `nexa:DataPath`, …).
+- [ ] **6.2 Drift detection** — diff against the documented desired state in this repo (`docs/12`, `CLAUDE.md`, the housekeeping campaign at #35–37). Emit findings as structured Memos comments: *"`open-webui` last used 38 d ago — retire?"*, *"Container `foo` has no `services/foo/` bind — schedule UNAS migration?"*.
+- [ ] **6.3 Steward commands** — `#nexa:retire <svc>` (tar to `backup/`, stop, archive the stack), `#nexa:document <svc>` (template a CLAUDE.md entry), `#nexa:wishlist-status` (which entries in [docs/13](./13-information-wishlist.md) are still needed).
+- [ ] **6.4 Self-update of docs** — when the user resolves an open question via Memos, Nexa proposes the corresponding edit to `docs/11-open-questions.md` as a PR-ready diff (the doc itself becomes a Nexa-managed surface).
+
+This phase is what turns Nexa from "an assistant that answers questions" into "an assistant that takes care of its own runtime", and it's the natural home for the cross-cutting [housekeeping campaign](./12-optimization-opportunities.md#housekeeping-campaign-cross-cutting-do-together) — most of those items become semi-automatic once 6.1–6.3 ship.