Why we say OK

Make a 70–75 second remake of Vox's explainer "Why we say OK" (https://www.youtube.com/watch?v=1UnIDL-eHOs) in Cue. Recreate how Vox edits, not its artwork: use only public domain and CC0 material, credit every source, and credit Vox as the original on the end card.

1. Read Cue's playbooks first: get_playbook "working-in-cue", "vox-explainer" and "example-why-we-say-ok". The last one is this video written down scene by scene: follow it.
2. Create a 1920×1080, 30 fps project. Script (8 lines):
   L1 There is a two-letter word you have probably said today without even thinking about it.
   L2 OK. It might be the most widely understood word on the planet. And it started as a joke.
   L3 In March 1839, the Boston Morning Post printed a strange little abbreviation: o. k., all correct.
   L4 Spelled wrong on purpose: oll korrect. Papers at the time were full of joke abbreviations like that, K C for knuff ced, O W for oll wright.
   L5 Almost all of them were forgotten within a year. OK was not, thanks to a president.
   L6 Martin Van Buren came from Kinderhook, New York. When he ran for re-election in 1840, his supporters called him Old Kinderhook, and started O.K. clubs.
   L7 He lost. But the word stuck. The telegraph needed a short reply that meant: message received. O K.
   L8 And today it is how we say yes without saying very much at all.
   Generate the voiceover and get word timings with get_transcript.
3. Download and import these public domain sources:
   - https://archive.org/details/WorldAtYourC ("The World at Your Call", 1950): telephone calls, telegraph poles, a switchboard
   - https://commons.wikimedia.org/wiki/File:Journal_des_Marchands_Tailleurs,_juin_1845,_No._97,_RP-P-2009-3238.jpg
   - https://commons.wikimedia.org/wiki/File:Martin_Van_Buren_daguerreotype_by_Mathew_Brady_circa_1849.jpg
   - https://commons.wikimedia.org/wiki/File:1827_Finley_Map_of_New_York_State_-_Geographicus_-_NewYork-finley-1827.jpg
   Use cut_out on the fashion plate and the portrait. Take paper, newsprint and sound effects from list_library_assets.
4. Build it scene by scene as in the example: archive cold open with red OK tags, the big red OK with the people in front, the clipping with marks that follow its punch-in, red blocks with cut-outs, the map push-in, the Old Kinderhook → O.K. type animation, the telegraph, the chat, the end card. Put grain and a vignette over everything with one adjustment layer, sound effects on every landing and push, and a music bed that stops before "He lost".
5. Check every scene and every mark with render_frame. Export to export/why-we-say-ok.mp4 (wait_for the result), look at frames of the file, and run analyze_reference on it: aim for 15–20 cuts a minute, mostly black and white, about −16 LUFS. Fix what is off and export again.
6. package_project with a README listing the sources.