Enhance algorithms and limits modules with improved functionality and tests

[FrozenLemonTee]

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[Copilot]

Pull request overview

This PR introduces an algorithms module layer (starting with limits and hash) and refactors existing modules to consume this shared “value metadata” API instead of directly using std::numeric_limits, with new basic tests to validate behavior for built-in and custom underlying types.

Changes:

• Add mcpplibs.primitives.algorithms module with limits and hash facilities.
• Refactor operations::invoker and conversion::underlying to use algorithms::{min,max,lowest}_value and algorithms::limits.
• Add new basic test suites for algorithms/limits and algorithms/hash, and wire them into the basic test CMake.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/basic/algorithms/limits/test_limits.cpp	Adds unit tests for algorithms::limits on builtin + custom underlying types.
tests/basic/algorithms/hash/test_hash.cpp	Adds unit tests for algorithms::hash/hash_value on builtin + custom underlying types.
tests/basic/CMakeLists.txt	Adds basic_algorithms_tests suite and includes it in basic_tests dependencies.
src/primitives.cppm	Re-exports the new mcpplibs.primitives.algorithms module from the umbrella module.
src/operations/invoker.cppm	Replaces std::numeric_limits usage with algorithms limit queries for overflow/shift checks.
src/conversion/underlying.cppm	Replaces std::numeric_limits usage with algorithms limit queries in risk/cast logic.
src/algorithms/limits.cppm	Introduces algorithms::limits and {min,lowest,max,epsilon,infinity,quiet_nan}_value APIs.
src/algorithms/hash.cppm	Introduces algorithms::hash, hashable, and hash_value, including an underlying-type adapter.
src/algorithms/algorithms.cppm	Adds the mcpplibs.primitives.algorithms aggregator module exporting hash + limits.
.agents/docs/plans/implementation-plan.md	Updates internal implementation plan with clarified layering/dependency direction.