README documentation bug: incorrect variable declaration placement

[krystophny]

DEFECT: README shows incorrect Fortran variable declaration placement causing compilation failure

REPRODUCTION:

1. Copy README object-oriented API example exactly
2. Variable declaration after executable statements: type(figure_t) :: fig
3. Compilation fails: 'Unexpected data declaration statement'

EVIDENCE:

• README line 49: Shows type(figure_t) :: fig after executable code
• Fortran requires all declarations before executable statements
• Code compiles when declaration moved to top of program

USER IMPACT: HIGH - New users copying README examples get compilation failures
ROOT CAUSE: Fortran syntax error in documentation
SCOPE: README.md documentation accuracy

SOLUTION: Move all variable declarations to declaration section of program

[krystophny]

Consolidated into Sprint #2 Issue #978 - README accuracy restoration