fix(#2190): replace MANAGER_AGENT fallbacks with "operator" for attribution

- loose_ends.rs: NULL submitter on legacy approval rows → "operator"
- questions.rs: NULL submitter on cancel_loose_end → "operator"
- server.rs: HostRequest::RequestSpawn submitter → "operator"
- dashboard.rs: web-UI spawn submitter → "operator"
- socket_server.rs: submit_init_config with no declared parent → "operator"
- mcp.rs: drop MANAGER_AGENT exception from check_send_allowed; keep <parent> only

hive-c0re/src/loose_ends.rs

@@ -16,7 +16,7 @@
 use std::time::{SystemTime, UNIX_EPOCH};
 
 use anyhow::Result;
-use hive_sh4re::{LooseEnd, MANAGER_AGENT};
+use hive_sh4re::LooseEnd;
 
 use crate::coordinator::Coordinator;
 
@@ -56,12 +56,12 @@ pub fn for_agent(coord: &Coordinator, agent: &str) -> Result<Vec<LooseEnd>> {
     }
     // Show each pending approval to the agent that submitted it. The
     // submitter column is NULL for rows predating it; those count as
-    // the root agent's.
+    // operator-initiated (no agent tracking predates the column).
     for a in coord.approvals.pending()? {
         let submitter = coord
             .approvals
             .submitter_of(a.id)?
-            .unwrap_or_else(|| MANAGER_AGENT.to_owned());
+            .unwrap_or_else(|| "operator".to_owned());
         if submitter != agent {
             continue;
         }