Interface: PrintEngineCapabilities

Engine-level capability flags.

Mirrors DeviceEntry.capabilities but for properties of the printhead / sensor / cutter on this specific engine. Open shape — drivers extend with family-specific keys via the index signature without touching the contracts package.

Promotion rule: a capability earns a named key here iff (a) it is implemented by ≥2 active drivers AND (b) at least one registry consumer (picker, rasterizer, docs badge, runtime UX) actually branches on it. Today: mediaDetection and autocut. Single-vendor (e.g. twoColor, genuineMediaRequired) lands on the index signature until a second vendor adopts.

Indexable

[k: string]: unknown

Driver-specific capability keys land here. Examples today: twoColor (Brother-only, two-colour ribbon path) and genuineMediaRequired (Dymo-only). Promote to a named key when a second active driver implements with compatible semantics.

Properties

Property	Type	Description
autocut?	boolean	Auto-cutter on this engine's paper path.
mediaDetection?	boolean	Whether this engine reports loaded media via getStatus(). What apps do on mismatch is an app-level decision; the contracts library does not block prints. See hardwareQuirks on entries where the printer's mismatch behaviour is non-obvious (Brother QL hard-rejects, Dymo 5xx silently misprints).