A module adding a battery to the bar had to write i3status-rust's TOML, so a second
bar could not take its place. node-bar now receives a bar-neutral block: the
contributor says what it shows, the holder renders it with its own template, places
every bar and place once, and a contribution may name a capability the machine must
report. The block is offered: the power module runs on servers without a bar.
A module's data section says what it keeps and how precious it is; the backup holder's lines,
binding stickiness, retirement on unassign and D13's conditions follow from it, so issue 273's
empty replacement is said and an unassigned module's data is remembered, not forgotten.
ADR 0214 / to-be 43: a node seat whose holder keeps nightly restore points of what every module on
the machine declares. A contribution of kind backup may name its module's own directories, filled
per module when placed. The catalogue check refuses a store provider that contributes no backup;
parsing does not, so the providers already running stay readable.