feat: add count command to report the number of notes#1
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Adds a 'count' subcommand that prints how many notes are stored, with correct singular/plural wording. Extracts the message into a pure countMessage() helper and adds tests covering the 0/1/many cases. notes.js now exports the helper and only runs main() when invoked directly.
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Adds a 'count' subcommand that prints how many notes are stored, with correct singular/plural wording. Extracts the message into a pure countMessage() helper and adds tests covering the 0/1/many cases. notes.js now exports the helper and only runs main() when invoked directly.