Add literal operators, factory functions, and tests for primitives

[FrozenLemonTee]

No description provided.

[Copilot]

Pull request overview

This PR adds user-defined literal operators for common underlying types and introduces with(...) factory helpers plus Size/Diff primitive aliases, with basic tests to validate the new APIs.

Changes:

• Add mcpplibs::primitives::literals user-defined literals for integral, floating, and character underlying types.
• Add with(...) primitive factory functions (including a policies-tuple overload) and types::Size / types::Diff aliases.
• Add basic test coverage for both literals and the with(...) factory behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/basic/underlying/literals/test_literals.cpp	Adds tests validating literal operator return types and values.
tests/basic/primitive/factory/test_make_primitive.cpp	Adds tests for with(...) factory helpers, default policies, tuple-policies overload, and new Size/Diff aliases.
src/underlying/impl.cppm	Implements exported literal operators and compile-time range checks for casts.
src/primitive/traits.cppm	Refactors make_primitive into meta::details and keeps make_primitive_t as the exported alias.
src/primitive/impl.cppm	Adds with(...) factory functions and types::Size / types::Diff primitive aliases.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.