Report which hotcell-server version a cell runs in its describe response - #73
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A cell's `hotcell.describe` answer carried only the protocol version, which stays at 1 across releases, so nothing in it said which `hotcell-server` release the cell ran. Add `server_version`, the cell's `HotCell::Server::VERSION`. ref: #21
This was referenced Sep 29, 2026
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Motivation
hotcell.describeis the request a cell answers on its control socket to say what it carries. The client sends it at app boot (HotCell.describe_cells), and operators poll it from a health endpoint. Its answer (control.rb) holdsv, the operations, the groups, and the configuration.vis the protocol version, the wire format. It is1and changes only when the format does. So two cells running different releases give the same answer, and an operator cannot tell whichhotcell-serverrelease a deployed cell runs without shelling into the container.Part of #21
Details
server_version, theHotCell::Server::VERSIONof the cell.control_test.rbboots a cell and checks the value it reports.