docs: file the PROCESSED sweep and two cross-project proposalsHEADmain

The sweep task carries the closing condition for the ladder change: when the fleet count reaches zero, the three transitional PROCESSED-* exclusions come out together. Left unwritten they become permanent, which rebuilds the hiding place the ladder change removed.

Two proposals arrived while that work was in flight. Both are filed rather than applied, because each restructures a rules file rather than fixing a defect. One consolidates the shell gotchas under a single heading and adds the ssh BatchMode PATH case. The other names a class: a claim recorded while some condition holds, still reading as fact after the condition lapses. Three projects hit it in one day. My read is that it widens the host-identity rule rather than earning a second rule beside it.

I also repaired a task whose source line pointed at an inbox file swept a month ago. That dangling reference is the worked example in the ladder commit.

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