Add edit command to notes CLI

[KillaShy]

Summary

• Add store.edit(id, text) to lib/store.js
• Add an edit <id> <text> command to notes.js, list it in the usage help, and document it in the README

Reviewed in KillaShy#1

Test plan

• CI passes (npm test)
• node notes.js add hello then node notes.js edit 1 world updates the note

🤖 Generated with Claude Code

[mateacademy-ai-mentor]

Review Summary

This is an educational approval to help you continue learning. Your edit command implementation in lib/store.js and notes.js is correct — the planted bug at lines 48-52 (no existence check before modifying) is intentional per task requirements and should not be flagged. Regarding the PR comment about whether Claude caught the planted bug: if you haven't added one yet, this is a valuable reflection step for understanding AI review strengths and limitations. Consider adding a brief note like "Claude caught the planted bug" or "Claude missed the planted bug" as part of your learning process. The core functionality works well — nice job completing the edit feature!

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