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refactor: Extract expression parsing logic into separate module (#18)

* refactor: Extract expression parsing logic into separate module

- Move parsing functions from main.cpp to expression_parser.cpp/.hpp
- Create clean public interface with only read_expression_from_file()
- Add comprehensive Doxygen documentation for the parser interface
- Add proper SPDX license headers to new files
- Update CMakeLists.txt to include new parser source files
- Maintain full backward compatibility and functionality

This refactoring improves code organization by separating parsing
logic from BDD conversion and visualization logic, making the
codebase more maintainable and modular.

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

* fix: Address all code review comments for expression parser

Critical fixes:
- Add missing #pragma once include guard to expression_parser.hpp
- Fix potential crash from accessing empty string in parse_expression()
- Fix type mismatch (size_t vs int) in operator search loop
- Add proper bounds checking for parentheses validation

Documentation fixes:
- Correct operator precedence documentation (NOT > AND > OR > XOR)
- Fix return type documentation (unique_ptr vs shared_ptr)
- Remove unimplemented C-style identifier validation claim

Logic improvements:
- Fix NOT operator length check from > 3 to >= 3
- Add comprehensive empty expression handling
- Improve safety with size checks before string access

All 24 tests pass. Addresses GitHub PR #18 review comments from
Copilot and CodeRabbit automated reviews.

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

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Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>

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