rename(#162): scrub remaining hm1nd references from comments and MCP instructions

All functional renames (MANAGER_NAME, MANAGER_AGENT → "root") were done in
earlier commits. This cleans up the stale `hm1nd` strings that remained in
doc comments, test fixture labels, and the manager MCP server instructions
(which told the manager its config lived at /agents/hm1nd/config/agent.nix).

hive-c0re/src/agent_ports.rs

@@ -84,7 +84,7 @@ mod tests {
     #[test]
     fn build_map_filters_manager() {
         // Use MANAGER_NAME in the input so the assert below actually
-        // exercises the filter path — a literal `"hm1nd"` would pass
+        // exercises the filter path — a literal `"root"` would pass
         // trivially if the constant ever changed and the filter
         // silently became a no-op.
         let names: Vec<String> = ["iris", MANAGER_NAME, "argus"]

hive-c0re/src/container_view.rs

@@ -30,7 +30,7 @@ pub struct DashboardLink {
 pub struct ContainerView {
     /// Logical agent name (no `h-` prefix). Used in action URLs.
     pub name: String,
-    /// Container name as nixos-container sees it (`h-foo`, `hm1nd`).
+    /// Container name as nixos-container sees it (`h-foo`, `root`).
     pub container: String,
     pub is_manager: bool,
     pub port: u16,
@@ -273,7 +273,7 @@ fn read_status(name: &str) -> (Option<String>, Option<i64>) {
 /// the manager, the logical agent name otherwise — so callers can
 /// reuse the same string they used to look the agent up.
 pub async fn read_agent_status_live(name: &str) -> (Option<String>, Option<i64>, bool) {
-    // The lifecycle helper wants the on-disk name (`hm1nd` for the
+    // The lifecycle helper wants the on-disk name (`root` for the
     // manager, the bare logical name for sub-agents) and internally
     // adds the `h-` prefix. Map the broker-side `MANAGER_AGENT`
     // sentinel back to the lifecycle name here so callers don't have

hive-c0re/src/dashboard.rs

@@ -2561,7 +2561,7 @@ fn transient_label(k: crate::coordinator::TransientKind) -> &'static str {
 }
 
 /// Convert either a logical name or a container name back to the logical
-/// name. Sub-agents are `h-foo` → `foo`; manager stays `hm1nd`.
+/// name. Sub-agents are `h-foo` → `foo`; manager stays `root`.
 fn strip_container_prefix(name: &str) -> String {
     name.strip_prefix(lifecycle::AGENT_PREFIX)
         .unwrap_or(name)

hive-c0re/src/main.rs

@@ -190,7 +190,7 @@ async fn cmd_serve(
         tracing::warn!(error = ?e, "startup migration failed");
     }
     // Auto-create the manager container if it isn't there yet. Block
-    // on this — without hm1nd the system has no manager harness.
+    // on this — without root the system has no manager harness.
     // Failures are logged but allowed: a broken auto-spawn shouldn't
     // make the dashboard unreachable for debugging.
     if let Err(e) = auto_update::ensure_manager(&coord).await {

hive-c0re/src/manager_server.rs

@@ -951,7 +951,7 @@ fn handle_edit_schedule(
 }
 
 /// Permission check for `CancelSchedule` on the manager surface.
-/// `requester` (always `hm1nd` here) can cancel its own schedules.
+/// `requester` (always `root` here) can cancel its own schedules.
 /// Sub-agent ownership is delegated to topology — see
 /// `crate::topology::is_descendant_of`. Also reused by
 /// `handle_fire_schedule_now` — fire-auth follows the same shape.

hive-c0re/src/reminder_scheduler.rs

@@ -172,7 +172,7 @@ pub fn write_payload(agent: &str, host_path: &Path, message: &str) -> Result<(),
 /// under. Every agent sees its state at `/agents/<container>/state/`
 /// (see `lifecycle::set_nspawn_flags`). Auto-file paths use the same
 /// prefix so the round-trip is symmetric. The manager logical name
-/// maps to its container name (`hm1nd`) per `lifecycle::MANAGER_NAME`.
+/// maps to its container name (`root`) per `lifecycle::MANAGER_NAME`.
 #[must_use]
 pub fn container_state_prefix(agent: &str) -> String {
     if agent == hive_sh4re::MANAGER_AGENT {