feat(expression,lua): add legacy List/Dict AST compatibility for protocol DSL

[cherninkiy]

What

• Added legacy AST nodes List and Dict to improve compatibility with external AST producers while keeping the parser surface strict.

Extended expression runtime support:

• evaluator now handles legacy List and Dict nodes.
• validator now traverses legacy List and Dict nodes in name collection and comprehension checks.

Extended Lua Wireshark generation:

• Lua expression compiler now supports legacy List and Dict nodes.
• Name reference collection for dependency ordering now supports legacy List and Dict nodes.

Added regression tests:

• evaluator coverage for legacy List and Dict evaluation.
• Lua compiler coverage for legacy List and Dict to Lua table output.

Why

This improves domain-focused interoperability for network protocol and binary format workflows where expression ASTs may be produced by adjacent tooling, while preserving current parser security boundaries (no new callable syntax exposed to user expressions).

Scope and safety

• No expansion of parser grammar.
• No runtime function-call execution path introduced.
• Compatibility-only extension for legacy container AST nodes.

Validation

Ran:

pytest -q test_expression_evaluator.py test_python_lua_generators.py

Result: 56 passed

Context

Selected domain-safe portability from https://github.com/protocollab-co/protocollab-octapi

[Copilot]

Pull request overview

Adds backwards-compatible support for legacy expression AST container nodes (List / Dict) across the expression runtime (evaluation + validation) and Lua (Wireshark) generation, enabling interoperability with external AST producers while keeping the expression parser unchanged.

Changes:

• Introduce legacy AST nodes List(elements=...) and Dict(pairs=...) and export them from protocollab.expression.
• Extend evaluator/validator and Lua expression compilation + name reference collection to handle the legacy nodes.
• Add regression tests covering legacy-node evaluation and Lua compilation.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/protocollab/expression/ast_nodes.py	Adds legacy List/Dict AST node dataclasses and includes them in ASTNode.
src/protocollab/expression/init.py	Exposes List/Dict in the public expression module API.
src/protocollab/expression/evaluator.py	Evaluates legacy List/Dict nodes equivalently to ListLiteral/DictLiteral.
src/protocollab/expression/validator.py	Traverses legacy List/Dict nodes in name collection and comprehension variable validation.
src/protocollab/generators/lua_generator.py	Compiles legacy List/Dict nodes to Lua tables and includes them in dependency name reference collection.
src/protocollab/tests/expression/test_expression_evaluator.py	Adds evaluation regression tests for legacy list/dict nodes.
src/protocollab/tests/generators/test_python_lua_generators.py	Adds Lua compilation regression tests for legacy list/dict nodes.

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