two-step agent spawn: request_init_config + request_spawn

hive-c0re/src/approvals.rs

@@ -307,6 +307,7 @@ fn kind_to_str(kind: ApprovalKind) -> &'static str {
     match kind {
         ApprovalKind::ApplyCommit => "apply_commit",
         ApprovalKind::Spawn => "spawn",
+        ApprovalKind::InitConfig => "init_config",
     }
 }
 
@@ -314,6 +315,7 @@ fn kind_from_str(s: &str) -> Result<ApprovalKind> {
     Ok(match s {
         "apply_commit" => ApprovalKind::ApplyCommit,
         "spawn" => ApprovalKind::Spawn,
+        "init_config" => ApprovalKind::InitConfig,
         other => bail!("unknown approval kind '{other}'"),
     })
 }