TUTOR_FROM = 2026-10-10 (the day after the deploy). The automation tutor
keeps confirmed_on=None, so it stays "new".
Ladder floor: a rung comes off the floor only for a pure bonus (no
penalty_from) or an earner whose penalty has started -- the same
_penalised() rule (first_credits -> penalty_start, confirmed_on fail-closed
fallback, penalty_from without first_credits) the gaming base uses. Before
this, a never-credited tutor would have lowered 2026-10-10's floor by its
full 50-minute rung (19:50 -> 19:00) even with first_credits. Maturity can
only raise time: new property test against the 0.6.0 floor formula.
ruff 0.17.0 (dependency-freshness): CPY001 ignored -- personal repo, no
copyright policy.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WdfmsGMht9ypyvxGPmNF1V
