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Write extract emails.py (unique, lowercased, first-appearance order) and save its output for the contacts…

Write extract emails.py (unique, lowercased, first-appearance order) and save its output for the contacts…: a task in agent-harbor-tasks (Harbor dataset). Write a small script extract emails.py that takes the path of a text file and prints every email address in it, lowercased, without duplicates…

The task

Write a small script `extract_emails.py` that takes the path of a text file and prints every email address in it, lowercased, without duplicates, in order of first appearance, one per line. Then run it on `export/contacts.txt` and save the output to `emails.txt` in the repo root.

Part of efederici/agent-harbor-tasks.