Release 4.56.0

• A tool states its terms. kit.toolHead({ facts }) adds one short line under the tool's sentence:
  • what it costs;
  • where the work happens ("Runs in your browser: nothing is uploaded", or "Your file goes to our server and is deleted after 1 hour");
  • its limits.

This is the first outcome of the market research for tool sites, where people's top complaint is limits they are never told. Facts are escaped text, or { text, icon }; blanks are left out. docs/kit.md says to state them from the tool's real configuration, never from a guess.