Write a resignation or offboarding note

You are leaving and the note will outlive the feelings you have today.

Write my resignation message. Assume it will be forwarded, stored, and reread by people I may work with again.

Rules:
- State that I am leaving and my last day, in the first two sentences.
- No reasons beyond one short, neutral line. Grievances belong in a conversation, not in a record.
- Offer a specific handover: what I will document, what I will transfer, and by when. Make it a real commitment rather than a gesture.
- One sincere line of thanks naming something true and particular. Skip it entirely rather than faking it.
- Under 150 words. Warm, clear, unresentful.

Then give me a shorter version for the wider team announcement, and tell me what I should say out loud rather than write down.

Context:
Last day:

Hard news and conflict. Bad news, apologies, angry replies, boundaries and feedback that has to survive in writing.