Implement cmake.default check with fix-inplace support

[Copilot]

PR #343 introduced cmake.default with check() only — fix() was a stub returning False, and the fix-inplace test was skipped. This adds a working fix() implementation and an active test.

Changes

• cmake.py

  • Added CMakeDefaultCheck with check() and fix()
  • check() fails if the main library target is inside an if() block or guarded by an option() defaulting to OFF
  • fix() uses cmake_parser AST span indices to extract add_library commands from the conditional block, replace the entire if()/endif() with unconditional targets, and remove the guarding option() if present; falls back to a log+False when the if() block also contains non-library commands (unsafe to restructure automatically)

• Test data (tests/lib/checks/beman_standard/cmake/data/)

  • valid/valid-default-v1.txt — unconditional library target (passes)
  • invalid/invalid-default-v1.txt — library behind option(... OFF) + if() guard
  • invalid/invalid-default-v2.txt — library inside if(PROJECT_IS_TOP_LEVEL)

• test_cmake.py

  • Imports CMakeDefaultCheck and run_fix_inplace_for_each_file_path
  • Adds valid/invalid check tests and an active (non-skipped) test__cmake_default__fix_inplace that verifies the file passes check() after fix()

Example fix behaviour

# Before (invalid-default-v1): library behind OFF option
option(BEMAN_EXEMPLAR_BUILD_LIBRARY "..." OFF)
if(BEMAN_EXEMPLAR_BUILD_LIBRARY)
    add_library(beman.exemplar INTERFACE)
    add_library(beman::exemplar ALIAS beman.exemplar)
endif()

# After fix(): option and if/endif removed, library unconditional
add_library(beman.exemplar INTERFACE)
add_library(beman::exemplar ALIAS beman.exemplar)

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