s850.py

from research import *
s=begin(850,'Freeze the full paired-anchor inverse field','Can one digit-register rule explain every existing pair of File52c endpoints?',{},['latest File52c §2.1 and AppendixA.2–A.3; inverse preparation audit'])
p=json.loads((ROOT/'prep/inverse_inputs.json').read_text());a=artifact('model/inverse_inputs.json',json.dumps(p,indent=2)+'\n')
finish(s,{'packet':a,'scope':'existing32 sources and64 endpoints; target columns excluded; original input durations only','hypothesis':'anchor dependence is generated by decimal borrow, core length and retained zero-placeholders'},'The entire original paired field is the next fixed reconstruction target. No extra dates, target counts, or second-pass reversal are admitted.','Close the first20-step checkpoint, then test the paired field.',{'packet_present':bool(p),'known_primary':'a5ea84562101158b60d0cf296765d6eff38e7a2abda4e74ad1b353dfd13b9530' in json.dumps(p)})