Implement the NATO converter with tests and Doxygen comments

Task: MIL-002#2
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src/nato_alphabet/main.py

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+"""@brief Composition root: wires the adapters into the use case."""
+
+from nato_alphabet import constants
+from nato_alphabet.adapters.console import TerminalConsole
+from nato_alphabet.adapters.csv_alphabet import CsvAlphabetSource, load_nato_dict
+from nato_alphabet.application.spell_word_session import SpellWordSession
+from nato_alphabet.domain.spelling import InvalidWordError, generate_phonetic
+
+__all__ = ["InvalidWordError", "generate_phonetic", "load_nato_dict", "main"]
+
+
+def main() -> int:
+    """@brief Run the interactive tool.
+
+    @return The exit status of the program.
+    """
+    SpellWordSession(CsvAlphabetSource(), TerminalConsole()).run()
+    return constants.EXIT_OK