fix(lance_parser): remove #[macro_export] pollution, fix CypherQuery collision

Item 4: Remove #[macro_export] from lance_plan_err!, lance_config_err!,
lance_exec_err! — these are bouncer-internal macros, not crate-level.
Only used in lance_parser/error.rs tests.

Item 5: Replace `pub use ast::*` glob re-export with explicit re-exports
excluding CypherQuery. lance_parser::ast::CypherQuery and cypher.rs::CypherQuery
are different types serving different roles — the glob made them collide
at the query module level. Now the bouncer's CypherQuery stays behind
lance_parser::ast:: and the old cypher.rs CypherQuery owns the unqualified name.

105/105 lance_parser tests pass. 6/6 error tests pass.

https://claude.ai/code/session_018L7tAcJ9ppReFdcjhYjTcb

Author: claude

src/query/lance_parser/error.rs

@@ -79,23 +79,20 @@ pub fn exec_err_at(message: String) -> GraphError {
 /// ```ignore
 /// let err = lance_plan_err!("Cannot join {} to {}", left, right);
 /// ```
-#[macro_export]
 macro_rules! lance_plan_err {
     ($($arg:tt)*) => {
         $crate::query::lance_parser::error::plan_err_at(format!($($arg)*))
     };
 }
 
 /// Create a ConfigError with zero-cost location capture.
-#[macro_export]
 macro_rules! lance_config_err {
     ($($arg:tt)*) => {
         $crate::query::lance_parser::error::config_err_at(format!($($arg)*))
     };
 }
 
 /// Create an ExecutionError with zero-cost location capture.
-#[macro_export]
 macro_rules! lance_exec_err {
     ($($arg:tt)*) => {
         $crate::query::lance_parser::error::exec_err_at(format!($($arg)*))

src/query/lance_parser/mod.rs

@@ -15,8 +15,16 @@ pub mod parameter_substitution;
 pub mod parser;
 pub mod semantic;
 
-// Re-export the main entry points
-pub use ast::*;
+// Re-export the main entry points.
+// NOTE: ast::CypherQuery deliberately excluded to avoid collision with
+// cypher.rs::CypherQuery. Use lance_parser::ast::CypherQuery if needed.
+pub use ast::{
+    ArithmeticOperator, BooleanExpression, ComparisonOperator, DistanceMetric,
+    FunctionType, GraphPattern, LengthRange, MatchClause, NodePattern, OrderByClause,
+    OrderByItem, PathPattern, PathSegment, PropertyRef, PropertyValue, ReadingClause,
+    RelationshipDirection, RelationshipPattern, ReturnClause, ReturnItem, SortDirection,
+    UnwindClause, ValueExpression, WhereClause, WithClause, classify_function,
+};
 pub use error::{GraphError, Result};
 pub use parameter_substitution::ParamValue;
 pub use parser::parse_cypher_query;