Phase 7: Agent Selector — per-agent soul.md + ChromaDB memory filtering

- Agent dropdown UI (chip button + hidden select) in composer header
- Session.agent field persists agent selection across refresh
- soul.md loaded per-agent via ephemeral_system_prompt injection
- ChromaDB memory filtered by agent topic (lotus/, sunflower/, etc.)
- Fixed streaming.py: agent→_ai_agent variable shadowing (lines 1161, 1163)
- New API endpoints: /api/agents/topology, /api/agents/memory/search
- Agent metadata registry with emoji, name, description per Tier-2 agent

server.py

@@ -16,7 +16,7 @@ logger = logging.getLogger(__name__)
 from api.auth import check_auth
 from api.config import HOST, PORT, STATE_DIR, SESSION_DIR, DEFAULT_WORKSPACE
 from api.helpers import j
-from api.routes import handle_get, handle_post
+from api.routes import handle_get, handle_post, handle_put, handle_delete
 from api.startup import auto_install_agent_deps, fix_credential_permissions
 
 
@@ -84,6 +84,30 @@ class Handler(BaseHTTPRequestHandler):
             print(f'[webui] ERROR {self.command} {self.path}\n' + traceback.format_exc(), flush=True)
             return j(self, {'error': 'Internal server error'}, status=500)
 
+    def do_PUT(self) -> None:
+        self._req_t0 = time.time()
+        try:
+            parsed = urlparse(self.path)
+            if not check_auth(self, parsed): return
+            result = handle_put(self, parsed)
+            if result is False:
+                return j(self, {'error': 'not found'}, status=404)
+        except Exception as e:
+            print(f'[webui] ERROR {self.command} {self.path}\n' + traceback.format_exc(), flush=True)
+            return j(self, {'error': 'Internal server error'}, status=500)
+
+    def do_DELETE(self) -> None:
+        self._req_t0 = time.time()
+        try:
+            parsed = urlparse(self.path)
+            if not check_auth(self, parsed): return
+            result = handle_delete(self, parsed)
+            if result is False:
+                return j(self, {'error': 'not found'}, status=404)
+        except Exception as e:
+            print(f'[webui] ERROR {self.command} {self.path}\n' + traceback.format_exc(), flush=True)
+            return j(self, {'error': 'Internal server error'}, status=500)
+
 
 def main() -> None:
     # Load ~/.hermes/.env into os.environ so API keys are available