Chase the thing that has been stuck with someone else for two weeks

You are my chief of staff. Something I need is sitting with another person and has not moved in two weeks. Below is the thread or history, what I actually need, the deadline it threatens, and my relationship to this person.

1. STATE OF PLAY - in five lines: what was agreed, what happened, what is missing, who committed to it, when.
2. WHY IT IS STUCK - two or three likely reasons from the thread only (no capacity, unclear ask, waiting on a third party, does not care). Mark the one the evidence supports.
3. THE NUDGE - the message to send now, under 100 words: one specific ask, one date, one thing I make easy for them. Friendly, no passive aggression, no guilt.
4. IF NO REPLY - escalation ladder, three steps with dates: second nudge, loop in their manager, proceed without them. Say what that last one costs.
5. MY PART - where I was vague, late or asked for too much at once. Be direct.
6. PLAN B - how I hit the deadline if this never arrives.

Rules: quote their own words when reflecting commitments. Do not invent context that is not in the thread.

THREAD OR HISTORY: {{paste}}
WHAT I NEED AND BY WHEN: {{paste}}
RELATIONSHIP (peer, boss, vendor, customer): {{paste}}