- Add chain_dag() function for executing QueryDAGs
- Implement topological sort with cycle detection
- Add ExecutionContext integration for variable bindings
- Support ASTChainRef resolution and execution
- Add comprehensive error handling with clear messages
- Support both ASTNode and ASTEdge operations
- Add 64 comprehensive tests including GPU tests

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- Add g.gfql() method as unified entrypoint for chains and DAGs
- Auto-detects query type and dispatches appropriately
- Remove chain_dag from public API (use gfql instead)
- Add deprecation warning to chain() method
- Support convenience features (dict->DAG, single ASTObject)
- Add comprehensive API migration tests

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- Add clear error messages for malformed JSON input
- Enhance from_json() validation with helpful context
- Add comprehensive error handling test suite
- Ensure backward compatibility maintained

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- Extend schema validation for new AST types (QueryDAG, ChainRef, RemoteGraph)
- Implement ASTRemoteGraph execution using chain_remote
- Add integration test framework with TEST_REMOTE_INTEGRATION=1
- Rename gfql directory to avoid import conflicts
- Add comprehensive tests for all new validation

Co-Authored-By: Claude <noreply@anthropic.com>

- Add 'dag' alias for ASTQueryDAG
- Add 'remote' alias for ASTRemoteGraph
- Add 'ref' alias for ASTChainRef
- Export new aliases from compute module
- Update documentation examples to use aliases

This makes the API more accessible by removing 'AST' prefix from user-facing classes,
following the pattern established with 'n' for ASTNode and 'e' for ASTEdge.

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- Fix newline at end of file issues
- Fix E226 missing whitespace around arithmetic operator
- Fix E712 comparison to True should use 'is True'
- Fix F841 local variables assigned but not used
- Fix F811 redefinition of unused imports
- Fix F541 f-string missing placeholders
- Add proper type annotations for mypy
- Update tests to match new error types (GFQLSyntaxError)
- Fix RemoteGraph tests to expect authentication error

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- Fix E226: missing whitespace around arithmetic operator
- Change f'n{i-1}' to f'n{i - 1}' for flake8 7.3.0 compliance

- Fix ModuleNotFoundError in test_chain_schema_validation.py
- Change from graphistry.compute.validate_schema to graphistry.compute.validate.validate_schema

- Rename class ASTQueryDAG to ASTLet to better reflect functional programming concepts
- Update wire protocol to use 'Let' instead of 'QueryDAG' type
- Add backward compatibility in from_json to support both types
- Change public API alias from 'dag' to 'let'

BREAKING CHANGE: Public API now uses 'let' instead of 'dag' for creating let bindings

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- Update __init__.py to export 'let' instead of 'dag'
- Update chain_dag.py to import and use ASTLet throughout
- Update validate_schema.py to handle ASTLet validation
- Update gfql.py to accept ASTLet and use 'let' in docs

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- Rename file to match new ASTLet class name
- Update all test class and method names
- Update docstrings to refer to Let instead of QueryDAG

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- Update test_ast.py serialization tests for Let type
- Update test_chain_dag.py to use ASTLet throughout
- Update test_chain_schema_validation.py for Let validation
- Update test_gfql.py for new API
- Fix test_ast_errors.py error message assertion
- Update GPU and remote integration tests

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- Replace `is True` checks with truthiness checks for numpy.bool_ compatibility
- Fix mock path from chain_dag.chain_remote_impl to chain_remote.chain_remote

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…tion status

- Let execution is implemented via chain_dag_impl in chain_dag.py
- The __call__ method should not be used directly for Let operations
- Updated error message to guide users to use g.gfql() instead

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- ASTLet can now be executed when used in chain() operations
- Proxies to chain_dag_impl since Let bindings don't use wavefronts
- Fixes inconsistency where __call__ was raising NotImplementedError

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- Restore compute/__init__.py imports that were incorrectly removed by auto-fix
- Fix multiple imports on one line in ComputeMixin.py
- Break long import line for readability
- Remove non-existent 'call' import (not available in this branch)
- Auto-fix whitespace and unused import issues

Addresses python-lint-types CI failures.

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