fix(curator): unify under auxiliary.curator (hermes model, dashboard) (#17868)

Voscko reported curator.auxiliary.provider/model was advertised in the
docs but ignored — the review fork read only model.provider/default. The
narrow fix would wire the one-off key through, but that leaves curator
as a parallel system: not in `hermes model` → auxiliary picker, not in
the dashboard Models tab, missing per-task base_url/api_key/timeout/
extra_body.

Unify curator with the rest of the aux task system so `hermes model`
and the dashboard configure it like every other aux task.

Four sources of truth updated:
- hermes_cli/config.py — add 'curator' slot to DEFAULT_CONFIG.auxiliary
  (timeout=600 since reviews run long), drop the one-off curator.auxiliary
  block from DEFAULT_CONFIG.curator.
- hermes_cli/main.py — add ('curator', 'Curator', 'skill-usage review pass')
  to _AUX_TASKS so the CLI picker offers it.
- hermes_cli/web_server.py — add 'curator' to _AUX_TASK_SLOTS so the
  dashboard REST endpoint accepts it.
- web/src/pages/ModelsPage.tsx — add Curator entry so the dashboard
  Models tab renders the task.

agent/curator.py _resolve_review_model() now reads auxiliary.curator
first (canonical), falls back to legacy curator.auxiliary (with an info
log asking users to migrate), then falls back to the main chat model.
Pre-unification users keep working.

Docs updated: docs/user-guide/features/curator.md now points at
`hermes model` → auxiliary → Curator and the dashboard Models tab.

Tests: 6 unit tests on _resolve_review_model (auto default, canonical
slot honored, partial override fallback, legacy fallback with
deprecation log assertion, new-wins-over-legacy, empty-config safety)
plus a cross-registry test that curator is wired into all four sources
of truth. test_aux_tasks_keys_all_exist_in_default_config already
covers the DEFAULT_CONFIG ↔ _AUX_TASKS invariant.

Reported by Voscko on Discord.

hermes_cli/config.py

@@ -709,6 +709,19 @@ DEFAULT_CONFIG = {
             "timeout": 30,
             "extra_body": {},
         },
+        # Curator — skill-usage review fork. Timeout is generous because the
+        # review pass can take several minutes on reasoning models (umbrella
+        # building over hundreds of candidate skills). "auto" = use main chat
+        # model; override via `hermes model` → auxiliary → Curator to route
+        # to a cheaper aux model (e.g. openrouter google/gemini-3-flash-preview).
+        "curator": {
+            "provider": "auto",
+            "model": "",
+            "base_url": "",
+            "api_key": "",
+            "timeout": 600,
+            "extra_body": {},
+        },
     },
     
     "display": {
@@ -949,12 +962,6 @@ DEFAULT_CONFIG = {
         # Archive a skill (move to skills/.archive/) after this many days
         # without use. Archived skills are recoverable — no auto-deletion.
         "archive_after_days": 90,
-        # Optional per-task override for the curator's aux model. Leave null
-        # to use Hermes' main auxiliary client resolution.
-        "auxiliary": {
-            "provider": None,
-            "model": None,
-        },
     },
 
     # Honcho AI-native memory -- reads ~/.honcho/config.json as single source of truth.