0.6.0

The line after the MVP. Opened 2026-09-23 when the owner defined the MVP as the release that closes 0.5.x: the mentor writes to the learning tier (item 1), the overdue nudge and retire/snooze (#26), pi core conditions discharged (#21). Moved here as real builds that are not MVP blockers: the low-energy ladder (#31), read-along (#33), OpenCode to core tier, the Jev struggle-eval measurement (not before 0.5.x closes). A minor bump is a deliberate owner decision; 1.0 stays reserved for a release judged fully complete.