docs: codebase review + documentation maintenance pass

Full review (plans/2026-07-17-codebase-review-and-cleanup.md) covering Go,
web SPA, and docs. Applied low-risk doc/tooling fixes; code refactors and
dead-code deletions are listed as actionable recommendations pending approval.

Doc fixes:
- AGENTS.md: remove ghost of retired request_execution (contradicted the
  retire notice above it); fix knowledge/wiki/ -> archive/knowledge/;
  replace brittle counts (33 tools, 36 docs, 20 checks) with pointers to
  source; drop point-in-time dates.
- OIKOS.md: fix broken plan link (now in done/); 001-011 -> 001-020;
  15 MCP tools -> pointer; replace hardcoded knowledge counts.
- README.md: 15 tools -> pointer; fix wails plan link (now in done/);
  complete internal/ package list (add checkdefaults, observability, safego);
  add cmd/desktop/ to repo layout.
- commands.md, page-templates.md: fix broken links; HERMES.md -> NOMOS.md.

Plans housekeeping:
- Move 4 done 2026-07-14 plans from plans/ to plans/done/.
- Reconcile plans/index.md: add the 2 missing 2026-07-14 entries and the
  2 missing 2026-07-15 done entries; add this review.
- Fix stale plan path in migrations/020 comment.

New docs:
- docs/index.md and docs/operations/README.md (folder READMEs per
  writing-style.md).

Tooling:
- web/package.json: add check/typecheck/lint scripts + svelte-check devDep.
- Makefile: desktop-package version now reads from VERSION file instead of
  hardcoded 0.1.0.

VERSION 0.7.6 -> 0.7.7 (patch: docs + tooling only).

AGENTS.md

@@ -42,8 +42,9 @@ the operator; see [CLIENTS.md](CLIENTS.md#enrollment) for the enrollment flow
 - `/opt/homelab-context/inventory.yaml` — every host, LXC, VM, and workstation
   with their mesh addresses, roles, and service mappings. This is the seed file;
   at runtime the DB is authoritative (query via MCP `get_entity` or the REST API).
-- `/opt/homelab-context/seeds/knowledge.yaml` — full narrative knowledge: 36
-  documents, 6 investigations, 12 runbooks. Ingested into the DB on deploy.
+- `/opt/homelab-context/seeds/knowledge.yaml` — full narrative knowledge
+  (documents, investigations, runbooks). Counts are not hardcoded here; count
+  them from the seed or query the DB. Ingested into the DB on deploy.
 - `/opt/homelab-context/.agents/operations/commands.md` — the operator's cheatsheet
   for pct, caddy, DNS, and the Oikos command surface.
 
@@ -55,7 +56,8 @@ Endpoint: `https://mcp.hubris.network/mcp`. Every call needs
 enrollment and `/healthz` (see "Authentication" below for where the token
 comes from).
 
-Available tools (33 total):
+Available tools (the authoritative list — count them below if a number is
+needed; do not hardcode the count elsewhere):
 
   Context — observe + orient:
     get_entity(slug), list_entities(type, limit, cursor),
@@ -111,10 +113,9 @@ Available tools (33 total):
       operator approval, and destructive patterns (rm -rf, dd, mkfs,
       pct/qm destroy, DROP TABLE, reboot, curl-pipe-to-shell, ...) always
       need approval regardless of what you declare. This is the ONLY
-      mutation tool — `request_execution` was retired 2026-07-14.
-    `run` — the general execution primitive. Run any shell
-      (restart, systemctl, pct_exec, apt_upgrade, pct_create). Still the
-      route for those specific actions; policy-gated the same way `run` is.
+      mutation tool — `request_execution` was retired 2026-07-14; the
+      former enum actions (restart, systemctl, pct_exec, apt_upgrade,
+      pct_create) are all expressed as `run(target, command)` now.
     get_execution_status(execution_id) — poll progress
 
 **When to prefer MCP over grepping the clone:** always for knowledge queries.
@@ -145,8 +146,8 @@ POST /api/v1/knowledge/{entity_slug}
 {"title": "...", "content": "...", "tags": ["..."]}
 ```
 
-The DB is the truth. The old wiki files are in `knowledge/wiki/` pending archive
-per the DB-as-source-of-truth plan.
+The DB is the truth. The old wiki files are archived at `archive/knowledge/`
+(historical reference only — use MCP `search_knowledge` for live queries).
 
 - **Runbook procedures** live as `runbook` entities in the DB and as SKILL.md
   files under `.agents/skills/<name>/`. They carry `risk_class`, `procedure`
@@ -162,8 +163,8 @@ per the DB-as-source-of-truth plan.
 ## 6. Acting on the homelab
 
 - **Read state**: use MCP tools. Nomos (the AI agent) is the primary
-  operator interface — it has 33 MCP tools for observe/orient/decide/act
-  (§3).
+  operator interface — it routes to the MCP tool list in §3 for
+  observe/orient/decide/act.
 - **Actions** (restart, logs, apt, pct exec, or anything else): Nomos calls
   `run` (the general execution primitive) via MCP. `reversible_low`/read-only actions execute
   immediately; `config_mutation` and `destructive` actions are queued for
@@ -191,16 +192,15 @@ on every client after `git pull`. This is handled by `tools/post-pull.sh`
 Currently auto-setup:
 - **Host checks** (`tools/setup-checks.sh`): Deploys `checks/install.sh`'s
   health-check scripts to `/opt/oikos/checks` on each host. The scheduler's
-  `ssh-script` check kind depends on these actually being there — 20 are
-  live in the DB as of 2026-07-12.
+  `ssh-script` check kind depends on these actually being there (count is
+  whatever is currently seeded in the DB — do not hardcode it here).
 
 To add a new auto-setup, create `tools/setup-<name>.sh` in the repo,
 commit and push. All enrolled clients pick it up within 5 minutes.
 
 To trigger sync manually: run `/opt/homelab/tools/context-poller.sh`, or
-wait for the 5-min timer. (This mechanism — and the server-side
-`tools_changed` detection behind it — only correctly recognized
-`setup-*.sh` scripts as of 2026-07-12; before that it silently matched
+wait for the 5-min timer. (The server-side `tools_changed` detection only
+correctly recognizes `setup-*.sh` scripts — earlier it silently matched
 nothing, so nothing auto-ran on any client via this path.)
 
 ## 9. Versioning