refactor: split optimizer/verifier/parser modules (mainline); add runner trace/directives; add LLVM terminator/select scaffolds; extract AST Span; update CURRENT_TASK with remaining plan

src/parser/expr/ternary.rs

@@ -0,0 +1,26 @@
+use crate::parser::{NyashParser, ParseError};
+use crate::parser::common::ParserUtils;
+use crate::tokenizer::TokenType;
+use crate::ast::{ASTNode, Span};
+
+#[inline]
+fn is_sugar_enabled() -> bool { crate::parser::sugar_gate::is_enabled() }
+
+impl NyashParser {
+    pub(crate) fn expr_parse_ternary(&mut self) -> Result<ASTNode, ParseError> {
+        let cond = self.expr_parse_coalesce()?;
+        if self.match_token(&TokenType::QUESTION) {
+            self.advance();
+            let then_expr = self.parse_expression()?;
+            self.consume(TokenType::COLON)?;
+            let else_expr = self.parse_expression()?;
+            return Ok(ASTNode::If {
+                condition: Box::new(cond),
+                then_body: vec![then_expr],
+                else_body: Some(vec![else_expr]),
+                span: Span::unknown(),
+            });
+        }
+        Ok(cond)
+    }
+}