Revision history: Hydronic Specialties

Datasheet constraints: every range, checkbox and listbox field now states its direction

Remade from scratch under the authoring cheatsheet: field inventory from the decision space, pressure-independent control valves owned as one assembly, coil control valves handed to the controls standard, ratings derived from the piping system, a trade-off note beside every choice

Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs

Remove in-body license/authorship footer and divider heading

Initial publication