Collect docs for C++ build systems (CMake, Ninja, Meson, Bazel)

[henry0816191]

Summary

Scrape and collect documentation for all C++ build systems listed in the investigation. CMake source is identified; Ninja, Meson, and Bazel sources need to be identified and collected.

Tools & known sources

• CMake: Docs
• Ninja: TBD (identify official docs)
• Meson: TBD (identify official docs)
• Bazel: TBD (identify official docs)

Acceptance criteria

• Doc sources identified for Ninja, Meson, and Bazel.
• Documentation scraped/collected for each build system.
• Output format and storage location agreed and documented.