Moves all test files from the `tdd/` directory to their corresponding `pkg/` subdirectories. This aligns with standard Go project structure and simplifies the test coverage workflow.
- Moves `tdd/crypt/crypt_test.go` to `pkg/crypt/`
- Moves `tdd/enchantrix/enchantrix_test.go` to `pkg/enchantrix/`
- Moves `tdd/trix/trix_test.go` to `pkg/trix/`
- Simplifies the `Taskfile.yml` to use a standard `go test` command.
- Removes the now-obsolete `tdd/` directory.
- Adds generated coverage files to `.gitignore`.
This commit introduces a new `tdd/` directory and adds a comprehensive test suite for the `crypt` package, covering hashing, checksums, and RSA functions.
- Adds a new `tdd/crypt_test.go` file with tests for all functions in the `crypt` package, following the "Good, Bad, Ugly" methodology.
- Deletes the old `pkg/crypt/crypt_test.go` to avoid redundancy.
- Fixes a build error in `examples/main.go` related to an updated function signature.
This commit refactors the test suites for the `crypt` and `trix` packages to follow the Good, Bad, and Ugly testing strategy.
- `_Good` tests cover the ideal "happy path" scenarios.
- `_Bad` tests cover expected failure scenarios with well-formed but invalid inputs.
- `_Ugly` tests cover malicious or malformed inputs designed to cause crashes or panics.
This new testing structure makes the test suite more organized, comprehensive, and robust.
Additionally, this commit includes a bug fix for the `Luhn` function, which now correctly handles empty and single-digit strings.
