Treat executable statements at file scope as syntax errors

[saidctb]

Motivation

• Enforce stricter Fortran syntax by preventing executable statements at file scope from being silently skipped so that such lines produce a clear syntax error.

Description

• Remove the branch that silently continued on self._is_executable_statement_start(stripped) in file-scope parsing so that executable-statement starts now fall through to _raise_invalid_fortran_syntax_line.

Testing

• Ran the test suite using pytest -q and all tests completed successfully.

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Codex Task

[codecov]

Codecov Report

❌ Patch coverage is 87.23404% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
c_parser/parser.py	83.78%	3 Missing and 3 partials ⚠️

Flag	Coverage Δ
py312	94.21% <87.23%> (-0.35%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
c_parser/models.py	98.14% <100.00%> (ø)
x2py/cli.py	99.46% <100.00%> (+<0.01%)	⬆️
c_parser/parser.py	89.84% <83.78%> (-0.62%)	⬇️

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