feat(ast): add species base to template declarations

Added optional species_base field to Template struct enabling
template-species inheritance syntax: `template Name: Species { ... }`.
Updated LALRPOP grammar and all Template construction sites.

src/resolve/convert.rs

@@ -583,6 +583,7 @@ mod tests {
 
         let template = ast::Template {
             name: "Person".to_string(),
+            species_base: None,
             fields: vec![Field {
                 name: "type".to_string(), // Changed from "species"
                 value: Value::Text("human".to_string()),
@@ -637,6 +638,7 @@ mod tests {
 
         let physical = ast::Template {
             name: "Physical".to_string(),
+            species_base: None,
             fields: vec![Field {
                 name: "height".to_string(),
                 value: Value::Number(0),
@@ -651,6 +653,7 @@ mod tests {
 
         let mental = ast::Template {
             name: "Mental".to_string(),
+            species_base: None,
             fields: vec![Field {
                 name: "iq".to_string(),
                 value: Value::Number(0),
@@ -710,6 +713,7 @@ mod tests {
 
         let base = ast::Template {
             name: "Human".to_string(),
+            species_base: None,
             fields: vec![Field {
                 name: "type".to_string(), // Changed from "species"
                 value: Value::Text("human".to_string()),
@@ -724,6 +728,7 @@ mod tests {
 
         let derived = ast::Template {
             name: "Person".to_string(),
+            species_base: None,
             fields: vec![Field {
                 name: "age".to_string(),
                 value: Value::Number(0),
@@ -791,6 +796,7 @@ mod tests {
 
         let template = ast::Template {
             name: "Person".to_string(),
+            species_base: None,
             fields: vec![Field {
                 name: "age".to_string(),
                 value: Value::Range(Box::new(Value::Number(18)), Box::new(Value::Number(65))),

src/resolve/links_prop_tests.rs

@@ -446,6 +446,7 @@ proptest! {
                 })),
                 valid_ident().prop_map(|name| Declaration::Template(Template {
                     name,
+                    species_base: None,
                     fields: vec![],
                     strict: false,
                     includes: vec![],

src/resolve/merge.rs

@@ -574,6 +574,7 @@ mod tests {
     ) -> Template {
         Template {
             name: name.to_string(),
+            species_base: None,
             fields,
             includes: includes.iter().map(|s| s.to_string()).collect(),
             strict,

src/resolve/names.rs

@@ -331,6 +331,7 @@ mod tests {
                 }),
                 Declaration::Template(Template {
                     name: "Person".to_string(),
+                    species_base: None,
                     fields: vec![],
                     strict: false,
                     includes: vec![],

src/resolve/prop_tests.rs

@@ -68,6 +68,7 @@ fn valid_template_decl() -> impl Strategy<Value = (String, Declaration)> {
     valid_ident().prop_map(|name| {
         let decl = Declaration::Template(Template {
             name: name.clone(),
+            species_base: None,
             fields: vec![],
             strict: false,
             includes: vec![],