Parser and AST (@signalql/parser)

The @signalql/parser package exposes:

• parse(query: string) → Query
• tokenize(query: string) for tokenizer debugging
• ParseError for structured failures

Implementation lives in @signalql/compiler; the standalone parser package gives downstream tools a stable import surface without pulling codegen unless needed.

Stability expectations

• AST node kinds (count, funnel) and fields align with schemas/signalql-ast-v0.1.schema.json.
• Breaking AST changes require a spec minor/major bump and schema revision.

Tests

See packages/parser/test/parser.test.ts and packages/compiler/test/compile.test.ts.