feat(suggestions): group wip/banner/editor under a separate 'system' category

System tags are kind=general, so their suggestions previously landed in the
General group. Give them their own 'system' suggestion category so the operator
reviews them apart from content tags: _current_heads maps is_system heads to
category 'system' (still trained as general heads, still gated by the 0.65
floor). Frontend: CATEGORY_ORDER/LABELS gain 'system'; SuggestionsPanel renders
a 'System' group first (small, collapsible, open — false positives easy to spot
and reject); the typed-dropdown shows the shield icon for system entries. Safe:
system-tag suggestions always carry a canonical_tag_id, so the create-by-kind
path (which would send 'system' as a TagKind) is never hit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

backend/app/services/ml/heads.py

@@ -326,7 +326,10 @@ async def _current_heads(session: AsyncSession, embedding_version: str):
             {
                 "tag_id": r.tag_id,
                 "name": r.name,
-                "category": _CATEGORY.get(r.kind, "general"),
+                # System tags (wip/banner/editor) are kind=general but group under
+                # their OWN "system" suggestion category so the operator reviews
+                # them apart from content tags (they still train as general heads).
+                "category": "system" if r.is_system else _CATEGORY.get(r.kind, "general"),
                 "auto_apply_threshold": r.auto_apply_threshold,
                 "is_system": bool(r.is_system),
             }

frontend/src/components/modal/SuggestionsPanel.vue

@@ -16,6 +16,16 @@
          of the rail (ImageViewer side layout), so a long suggestion set no
          longer needs an internal scroll cap to keep Related reachable. -->
     <div v-else class="fc-suggestions__list">
+      <!-- System hygiene tags (wip/banner/editor) surface in their own group,
+           first, so false positives are easy to spot and reject (reject-to-train
+           for these heads). Small set — collapsible, open by default. -->
+      <SuggestionsCategoryGroup
+        v-if="store.byCategory.system && store.byCategory.system.length"
+        label="System" :items="store.byCategory.system"
+        collapsible :default-open="true"
+        @accept="onAccept" @alias="onAlias" @remove-alias="onRemoveAlias"
+        @dismiss="onDismiss" @undismiss="onUndismiss"
+      />
       <SuggestionsCategoryGroup
         v-for="cat in peopleCats" :key="cat"
         v-show="store.byCategory[cat] && store.byCategory[cat].length"

frontend/src/components/modal/TagAutocomplete.vue

@@ -154,6 +154,9 @@ const KNOWN_KINDS = new Set([
 const KIND_ICONS = {
   general: 'mdi-tag', character: 'mdi-account-circle',
   fandom: 'mdi-book-open-page-variant', series: 'mdi-bookshelf',
+  // 'system' is a suggestion category (wip/banner/editor), not a tag kind —
+  // matches the shield marker on system-tag chips.
+  system: 'mdi-shield-outline',
 }
 function iconFor (k) { return KIND_ICONS[k] || 'mdi-tag' }
 

frontend/src/stores/suggestions.js

@@ -5,11 +5,13 @@ import { useApi } from '../composables/useApi.js'
 import { useAsyncAction } from '../composables/useAsyncAction.js'
 import { useInflightToken } from '../composables/useInflightToken.js'
 
-// Category display order: people first, general last.
-// 'artist' (FC-2d-vii-c) and 'copyright' (2026-06-01) retired — only
-// character and general surface as suggestion categories now.
-export const CATEGORY_ORDER = ['character', 'general']
+// Category display order: system (hygiene flags) first for quick review, then
+// people, general last. 'artist' (FC-2d-vii-c) and 'copyright' (2026-06-01)
+// retired. 'system' groups the wip/banner/editor hygiene tags apart from content
+// tags (they're kind=general on the backend but surface under their own category).
+export const CATEGORY_ORDER = ['system', 'character', 'general']
 export const CATEGORY_LABELS = {
+  system: 'System',
   character: 'Character',
   general: 'General'
 }

tests/test_ml_suggestions.py

@@ -124,9 +124,11 @@ async def test_system_tag_surfaces_at_flat_floor_despite_high_threshold(db):
     await _head(db, tag.id, slot=0, suggest_threshold=0.9)
     await db.commit()
     sl = await SuggestionService(db).for_image(img.id)
+    # System tags surface under their OWN "system" category, not "general".
     assert any(
-        s.canonical_tag_id == tag.id for s in sl.by_category.get("general", [])
+        s.canonical_tag_id == tag.id for s in sl.by_category.get("system", [])
     )
+    assert not sl.by_category.get("general")
 
 
 @pytest.mark.asyncio
@@ -139,7 +141,7 @@ async def test_system_tag_below_floor_stays_hidden(db):
     await _head(db, tag.id, slot=0, suggest_threshold=0.9)
     await db.commit()
     sl = await SuggestionService(db).for_image(img.id)
-    assert not sl.by_category.get("general")
+    assert not sl.by_category.get("system")
 
 
 @pytest.mark.asyncio