feat: update access token environment variables and enhance device signing process for E2EE agents; add verification script and system flow documentation

agents/asistente2/config.yaml

@@ -115,7 +115,7 @@ tools:
 matrix:
   homeserver: "https://matrix-af2f3d.organic-machine.com"
   user_id: "@asistente-2:matrix-af2f3d.organic-machine.com"
-  access_token_env: MATRIX_TOKEN_ASISTENTE2
+  access_token_env: MATRIX_TOKEN_ASISTENTE_2
   device_id: "XUGTSZJYFQ"
 
   encryption:

agents/assistant/config.yaml

@@ -116,7 +116,7 @@ tools:
 matrix:
   homeserver: "https://matrix-af2f3d.organic-machine.com"
   user_id: "@assistant-bot:matrix-af2f3d.organic-machine.com"
-  access_token_env: MATRIX_TOKEN_ASSISTANT
+  access_token_env: MATRIX_TOKEN_ASSISTANT_BOT
   device_id: "SMWMRKMHDH"
 
   encryption:

agents/runtime.go

@@ -68,6 +68,13 @@ func New(cfg *config.AgentConfig, rules []decision.Rule, logger *slog.Logger) (*
 			}
 		}
 
+		// Sign own device with the self-signing key so Element shows it as verified.
+		if err := matrixClient.SignOwnDevice(context.Background()); err != nil {
+			logger.Warn("failed to sign own device (non-fatal)", "err", err)
+		} else {
+			logger.Info("own device signed with cross-signing key")
+		}
+
 		logger.Info("e2ee ready")
 	}