floats iter 1.1: Literal::Float variant + canonical hex serde + drift-test anchors

crates/ailang-core/tests/design_schema_drift.rs

@@ -219,6 +219,7 @@ fn design_md_anchors_every_literal_variant() {
         (r#""kind": "bool""#, Literal::Bool { value: true }),
         (r#""kind": "str""#, Literal::Str { value: "x".into() }),
         (r#""kind": "unit""#, Literal::Unit),
+        (r#""kind": "float""#, Literal::Float { bits: 0 }),
     ];
 
     for (anchor, lit) in exemplars {
@@ -227,6 +228,7 @@ fn design_md_anchors_every_literal_variant() {
             Literal::Bool { .. } => "bool",
             Literal::Str { .. } => "str",
             Literal::Unit => "unit",
+            Literal::Float { .. } => "float",
         };
         assert!(
             DESIGN_MD.contains(anchor),

crates/ailang-core/tests/spec_drift.rs

@@ -219,6 +219,7 @@ fn spec_mentions_every_literal_variant() {
         ("`true`, `false`", Literal::Bool { value: true }),
         ("`STRING`", Literal::Str { value: "x".into() }),
         ("(lit-unit)", Literal::Unit),
+        ("`FLOAT`", Literal::Float { bits: 0 }),
     ];
 
     for (anchor, lit) in exemplars {
@@ -227,6 +228,7 @@ fn spec_mentions_every_literal_variant() {
             Literal::Bool { .. } => "bool",
             Literal::Str { .. } => "str",
             Literal::Unit => "unit",
+            Literal::Float { .. } => "float",
         };
         assert!(
             FORM_A_SPEC.contains(anchor),