feat: Add runtime check that validates the defaultHash/hashMode combo

[webJose]

Closes #114.

[Copilot]

Pull request overview

This PR adds runtime validation to ensure that defaultHash and hashMode configuration options are compatible with each other, preventing invalid combinations that could lead to unexpected behavior.

Key changes:

• Added validation logic in setRoutingOptions that throws errors when incompatible hashMode/defaultHash combinations are detected
• Added comprehensive test coverage for the validation logic and general setRoutingOptions behavior
• Updated existing tests to use valid option combinations and more robust assertions

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/lib/kernel/options.ts	Added runtime validation to throw errors when hashMode and defaultHash have incompatible values
src/lib/kernel/options.test.ts	Added comprehensive tests for setRoutingOptions including validation scenarios and valid combinations
src/lib/kernel/initCore.test.ts	Updated tests to use valid hashMode/defaultHash combinations and improved cleanup verification

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