Add edit command to notes tool

[Iter1993]

Adds an edit <id> <text> command plus scaffolding (config, tests, CI, .gitignore). See review notes on the fork PR: Iter1993#1

[mateacademy-ai-mentor]

Review Summary

The edit function in lib/store.js has a critical bug that needs fixing. When data.notes.find() returns undefined (because the note ID doesn't exist), line 51 attempts to set note.text = text, which throws a TypeError: Cannot set property 'text' of undefined. This crashes the application instead of gracefully handling the error. Unlike remove() which returns a boolean for success/failure, edit() has no null check and returns nothing, making it impossible for callers to distinguish success from failure. To fix this, add a null check after the find() call: if the note isn't found, return false (or throw a descriptive error), and return true on successful edit. Then update the edit case in notes.js to check this return value before printing the success message, so users get proper feedback when trying to edit a non-existent note.

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[mateacademy-ai-mentor]

Bug here: If no note has the given id, find() returns undefined. Then line 51 tries to set undefined.text, throwing a TypeError. Consider returning a boolean (like remove() does) or throwing a descriptive error, and handle it in notes.js.