claude@clouddev1
59e6a541bf
The stratified WHERE-expression grammar — or / and / not / bool_primary / predicate tiers as named `static` Node fragments, recursing through `Subgrammar`. Covers the six comparison operators (`<>` and `!=` both NotEq), AND / OR / NOT, parentheses, LIKE / IN / BETWEEN with optional infix NOT, and IS [NOT] NULL. `predicate_tail` factors the shared operand prefix and the infix NOT so the Choice branches discriminate on a cleanly-failing first token. New recursive Expr / Predicate / Operand / CompareOp AST in dsl::command. `build_expr` folds the flat matched-terminal slice into an Expr — a deterministic recursive descent mirroring the grammar tiers, with single-child tiers collapsing. Per ADR-0026 §3 option 1: the walker stays a pure structural matcher; Expr is assembled only in this submit-time fold. Fragment + builder are unit-tested standalone (walk against &OR_EXPR, then build_expr); not yet wired into any command.