fix(cmake): Change include_guards from the global scope to the current scope, to enable find_package calls from different scopes to succeed (fixes #74).

[davidlion]

Description

This PR changes the install scripts from include_guard(GLOBAL) to include_guard(). The GLOBAL flag unnecessarily applies the guard to an entire project calling find_package. Without the flag, ystdlib can be found and used in multiple independent scopes successfully.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

• CI passing.
• Changes tested against this CLP PR by @gibber9809.

Summary by CodeRabbit

• Refactor
  • Standardized CMake include guards across library configuration packages by switching to the default scope for more consistent behaviour.
• Chores
  • Cleaned up build configuration to improve consistency and predictability when integrating with downstream CMake projects.

[coderabbitai]

Walkthrough

All four CMake config templates in cmake/ystdlib/libs switched include_guard(GLOBAL) to include_guard(). Other includes remain unchanged.

Changes

Cohort / File(s)	Summary
Include guard scope adjustment (CMake config templates) cmake/ystdlib/libs/containers-config.cmake.in, cmake/ystdlib/libs/error_handling-config.cmake.in, cmake/ystdlib/libs/io_interface-config.cmake.in, cmake/ystdlib/libs/wrapped_facade_headers-config.cmake.in	Replace include_guard(GLOBAL) with include_guard(); retain existing include lines (…-target.cmake and, where applicable, wrapped_facade_headers-config.cmake).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.
Title Check	✅ Passed	The title clearly and concisely summarizes the primary change of switching include_guard from global to current scope and explains the purpose of enabling find_package calls across different scopes while referencing the related issue.

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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[gibber9809]

LGTM. I also previously tested that this change fixes things for the approach taken by this CLP PR.