2.x — vision (history slot)

Per-era vision record for the 2.x architecture track. This is part of the versioned history beneath the living architecture (see the architecture README for the boundary and decay rules).

This page is the slot itself: when a piece of the living vision (docs/architecture/vision/README.md) is no longer current or future and belongs to the 2.x era, it is demoted onto this page. History accrues by era; nothing is deleted.

Empty until a living vision artifact decays into the 2.x era.