drop the manager socket, the no-op migrate branch and other ruth special cases

start_manager bound the same path register_agent binds. The migrate branch, hive-priv-sock::MANAGER_NAME and MANAGER_CONTAINER were no-ops or dead. The send allow-list docs promised a manager exemption the code never had. Tests that used ruth as the manager fixture use plain names.

hive-agent-mcp/src/mcp/args.rs

@@ -6,7 +6,7 @@ use rmcp::schemars;
 
 #[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
 pub struct SendArgs {
-    /// Logical agent name to deliver the message to (e.g. `"manager"`,
+    /// Logical agent name to deliver the message to (e.g. `"bob"`,
     /// `"alice"`). `"operator"` is refused: reach the operator over matrix
     /// if you have it.
     pub to: String,
@@ -106,7 +106,7 @@ pub struct SetStatusArgs {
 
 #[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
 pub struct GetAgentMetaArgs {
-    /// Logical name of the agent to query (e.g. `"iris"`, `"manager"`).
+    /// Logical name of the agent to query (e.g. `"iris"`, `"bob"`).
     /// Omit to query your own identity + status — replaces the
     /// previous `whoami` self-introspection tool.
     #[serde(default)]

hive-agent-mcp/src/mcp/mod.rs

@@ -148,7 +148,7 @@ impl AgentServer {
         let log = format!("{args:?}");
         let to = args.to.clone();
         // Check per-agent allow-list (services.hyperhive.agent.allowedRecipients). When no
-        // policy file is present (e.g. manager containers) the check is a no-op.
+        // policy file is present the check is a no-op.
         if let Err(refusal) = crate::send_allow::check_send_allowed(&to) {
             return run_tool_envelope("send", log, async move { refusal }).await;
         }

hive-agent-mcp/src/send_allow.rs

@@ -7,8 +7,7 @@
 /// Where the NixOS module writes the per-agent send allow-list (see
 /// `nix/agent-modules/mcp.nix`). Empty list = unrestricted (the
 /// default). Non-empty list constrains `mcp__hyperhive__send`'s `to`
-/// field; the manager is always implicitly permitted regardless of
-/// the list contents.
+/// field.
 const SEND_ALLOW_PATH: &str = "/etc/hyperhive/send-allow.json";
 
 /// Enforce the per-agent send allow-list. Returns `Ok` when the