feat: system agent icons — spider (TIC), firefly (private lint), bee (shared lint)

System agents now form an insect family, visually distinct from chat agents:
- TIC: Cat → Spider 🕷️ (new icon replaces old)
- Private Memory Lint: Firefly ✨ (new icon + meta.json field)
- Shared Memory Lint: Bee 🐝 (new icon + meta.json field)

Updated agents/README.md and SKALD.md.

agents/README.md

@@ -22,6 +22,8 @@ VectorPaintDaal. A warm friendly {ANIMAL} character with a gentle smile, wearing
 
 ## Per-agent reference
 
+### Chat agents — warm animals
+
 | Agent | Animal | Role | Elements | Palette |
 |-------|--------|------|----------|---------|
 | **Main Assistant** 🦊 | Fox | General assistant | Glowing threads connecting a heart, star, house | Terracotta, amber, gold |
@@ -33,10 +35,19 @@ VectorPaintDaal. A warm friendly {ANIMAL} character with a gentle smile, wearing
 | **Software Engineer** 🔧 | Bear | Focused builder | Glowing wrench, gears, circuit board, hammer, sparks | Terracotta, orange, amber, steel grey |
 | **Spec Writer** 📝 | Owl | Wise scribe | Glowing quill, scrolls, open books, words floating mid-air | Deep indigo, burnished gold, amber, cream |
 | **Tech Lead** 👑 | Stag | Confident strategist | Holographic kanban board, task cards, sub-agent symbols | Warm amber, deep teal, gold, coral |
-| **TIC** 👁️ | Cat | Watchful guardian | Sensor nodes, radar arcs, notification symbols (bell, letter, calendar) | Dark purple, amber, soft cyan, warm grey |
 | **Business Analyst** 💼 | Magpie | Thoughtful evaluator | Glowing clipboard, floating documents, abacus, data points | Deep indigo, gold, soft teal, amber |
 | **Companion** 🦦 | Otter | Children's friend | Glowing pencil, smiling sun, star, open book, paintbrush | Soft coral, amber, gold, gentle teal |
 
+### System agents — insect family
+
+System agents (`type: "system"`) are invisible background agents that maintain the platform. They use insect characters to visually distinguish them from chat-facing agents.
+
+| Agent | Animal | Role | Elements | Palette |
+|-------|--------|------|----------|---------|
+| **TIC** 👁️ | Spider 🕷️ | Watchful guardian | Sensor nodes, glowing web, radar arcs, notification symbols (bell, letter, calendar) | Dark purple, amber, soft cyan, warm grey |
+| **Private Memory Lint** 🧹 | Firefly ✨ | Private memory caretaker | Glowing lantern, memory fragments, tiny notes, sparkles | Warm gold, amber, soft teal, gentle green |
+| **Shared Memory Lint** 🧹 | Bee 🐝 | Shared space caretaker | Scroll with guidelines, honey dipper, honeycomb shapes, tiny documents | Warm amber, gold, soft teal, honey |
+
 ## Adding a new agent icon
 
 1. Generate the image using the Vector Paintings prompt template above (include `VectorPaintDaal` at the start)

agents/memory-lint-private/meta.json

@@ -15,5 +15,6 @@
   "type": "system",
   "inject_skills": false,
   "inject_memory": ["user-memory/index.md"],
+  "icon": "icon.png",
   "strength": "medium"
 }

agents/memory-lint-shared/meta.json

@@ -15,5 +15,6 @@
   "type": "system",
   "inject_skills": false,
   "inject_memory": ["shared-memory/index.md"],
+  "icon": "icon.png",
   "strength": "medium"
 }