001 update cst types

[akollegger]

brings this project up-to-date with tree-sitter-gram@0.2.0

[Copilot]

Pull Request Overview

This PR updates the gram CST type definitions to align with tree-sitter-gram@0.2.0, introducing a new stringifyCst utility for s-expression output and comprehensive corpus-based regression tests.

Key Changes:

• Updated CST type definitions to match tree-sitter-gram@0.2.0 grammar (renamed arrow types, new node types like symbol, annotation, tagged_string)
• Added stringifyCst function for deterministic s-expression output matching tree-sitter CLI conventions
• Implemented corpus-based regression test suites covering positive and error cases

Reviewed Changes

Copilot reviewed 87 out of 90 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/gram/src/lib/parser/cst-types.ts	Complete rewrite aligning CST types with updated grammar, replacing old arrow types with new taxonomy
packages/gram/src/lib/parser/cst-stringify.ts	New stringifier implementation for CST → s-expression conversion
packages/gram/src/lib/parser/corpus-loader.ts	Corpus fixture loader for regression testing
packages/gram/src/lib/parser/corpus-positive.spec.ts	Positive corpus case validation tests
packages/gram/src/lib/parser/corpus-errors.spec.ts	Error corpus case validation tests
packages/gram/src/lib/parser/grammar-metadata.ts	Grammar metadata accessor for node type validation
packages/gram/src/lib/parser/parser.ts	Updated to use new CST type taxonomy and handle renamed fields
packages/gram/README.md	Added stringifier usage examples and upgrade notes
packages/gram/package.json	Updated dependencies including tree-sitter and effect versions
package.json	Updated Nx toolchain and dependencies to v22
tsconfig.base.json	Removed deprecated gram-old package path, added @gram-data/data

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