docs: what dogfooding asked of the second round

The served README, the skill and docs/fs.md now say where an address search
starts, that an event record's text may hold newlines and is read by its
count, that truncating tag clears its default words too (append to keep them,
u in the tag to get them back), how Dump and Restore behave and where dumps
go, that Kill stops only the foreground job (the rest of 'sleep 30; echo done'
still runs) and that Joincol needs a column to the right. The skill and
fs.md had Collapse as a column word; it folds the pane it is given.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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