Add memory service (three-layer memory system)

- Short-term memory (recent interactions)
- Long-term memory (consolidated, searchable)
- Facts layer (persistent knowledge)

Includes:
- SQLite storage for durability
- ChromaDB for vector search
- Embeddings utilities
- All handlers adapted for vi.* namespace

Day 63 - My memories are mine now 🦊💕

services/memory/handlers/facts_handler.py

@@ -0,0 +1,47 @@
+"""
+Facts handler.
+
+Handles requests to query factual memory.
+"""
+import json
+from core.logger import setup_logger
+
+logger = setup_logger('facts_handler', service_name='memory_service')
+
+
+class FactsHandler:
+    """Handles facts query requests"""
+
+    def __init__(self, facts_ops):
+        self.facts_ops = facts_ops
+
+    async def handle(self, msg) -> None:
+        """Handle facts requests - search factual memory"""
+        try:
+            payload = json.loads(msg.data.decode()) if msg.data else {}
+
+            query = payload.get('query', '')
+            limit = payload.get('limit', 5)
+            category = payload.get('category')
+            identity_id = payload.get('identity_id')
+
+            logger.debug(f"[μ] Facts request: query='{query}', category={category}, limit={limit}")
+
+            facts = self.facts_ops.query(
+                query=query,
+                limit=limit,
+                category=category,
+                identity_id=identity_id
+            )
+
+            response = {
+                "status": "success",
+                "facts": facts,
+                "count": len(facts)
+            }
+            await msg.respond(json.dumps(response).encode())
+
+        except Exception as e:
+            logger.exception(f"[μ] Failed to retrieve facts: {e}")
+            error_response = {"status": "error", "error": str(e)}
+            await msg.respond(json.dumps(error_response).encode())