Modernize CMake build system with target-based dependencies and FetchContent fallback#5

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Copilot wants to merge 3 commits intomasterfrom

copilot/refactor-cmake-to-idiomatic

Commits on Jan 31, 2026

Initial plan
Copilot
committed
Modernize CMake build system with target-based dependencies and FetchContent fallback

Copilot
and
hdclark
committed
Address code review feedback: remove duplicate compile definitions and fix MEMORY_CONSTRAINED_BUILD

Copilot
and
hdclark
committed