Decisions

Recorded deviations from a skill rule or from the documentation standard. Each entry carries a sunset date at which it is reviewed; use docs/templates/decision.md for new entries.

Decision	Date	Sunset	Summary
Air and Air Hub as single self-contained specifications	2026-09-14	2026-12-31	The P05 Air and Air Hub packages carry no separate design document; the spec holds the design content. Superseded 2026-09-22.
Switch line: one four-slot model per product, common supplier clauses at line level	2026-09-22	2027-03-31	Every Switch product carries brief, spec, design and guide; the line directory also carries P05-switch-guide.md with the clauses common to the three guides.
Air Hub platform combinations with device grades below the family temperature rule	2026-09-27	2027-03-31	The Air Hub spec defines 30 named platform / CAN / radio combinations; H1–H6 and (amended 2026-10-06) the selected entry platform H15, an SSD2351 core board rated −20…+70 °C, use SoCs rated −20 °C minimum, below the family −25 °C rule, and H6 / H7 must prove their thermal margin.
Air Hub supply range 9–36 V instead of the family 8–32 V	2026-10-14	2027-03-31	Air Hub, Air Hub Pro and Air Hub Mini run from 9–36 V continuous; the 9 V lower bound is above the family 8 V, and the 32 V input protection must be re-rated for 36 V.
YBO bus connector: M8 4-pin	2026-10-20	2027-03-31	Draft family decision: the YBO bus (V+, GND, CAN-H, CAN-L) uses an M8 4-pin A-coded panel socket (60 V variant); adopted on the Air Hub family, where USB-C PD has priority over the M8 supply.