Add TNT configuration directives and tree export commands to script

Updates the generated TNT script with configuration parameters and appends tree management commands for saving and exporting results. Modifications are strictly limited to string literals written to the output stream.

src/Cargo.lock

@@ -1793,7 +1793,7 @@ dependencies = [
 
 [[package]]
 name = "obikmer"
-version = "1.1.44"
+version = "1.2.0"
 dependencies = [
  "clap",
  "csv",

src/obikmer/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "obikmer"
-version = "1.1.44"
+version = "1.2.0"
 edition = "2024"
 
 [[bin]]

src/obikmer/src/cmd/phylo/tnt.rs

@@ -46,6 +46,10 @@ pub(super) fn write_sankoff_tnt(
 
     let n_sites = alignment.sequences.first().map(|s| s.len()).unwrap_or(0);
     writeln!(f, "xread").unwrap();
+    writeln!(f, "mxram 16000;").unwrap();
+    writeln!(f, "taxname =;").unwrap();
+    writeln!(f, "taxname +50;").unwrap();
+
     writeln!(
         f,
         "'obikmer central-position SNP families, calibrated Sankoff 16-state encoding'"
@@ -166,9 +170,7 @@ pub(super) fn write_sankoff_tnt(
     writeln!(f, ";").unwrap();
     writeln!(f, "hold 20;").unwrap();
     writeln!(f, "mult;").unwrap();
-    writeln!(f, "taxname =;").unwrap();
+    writeln!(f, "export - {tre_name};").unwrap();
-    writeln!(f, "tsave * {tre_name};").unwrap();
-    writeln!(f, "tsave /;").unwrap();
 
     info!(
         "TNT script → {path} (costs scaled x{cost_scale:.0}, runs a default `hold 20; mult;` \