The bool encoded 'no time axis' which is now expressed at the type
level (T = Untimed). The old !self.time branch generated sequential
i64 timestamps internally (1..=n) and bumped all agents' last_time at
every tick; tests that relied on this now pass those timestamps
explicitly and reflect the correct time=true elapsed semantics.
Collapsed `if self.time { A } else { B }` into the A branch everywhere
in add_events_with_prior. Removed the two !self.time blocks that
updated all agents' last_time at every slice regardless of participation.
sort_time is now generic over `T: Copy + Ord`.
HistoryBuilder::time(bool) removed. History<i64, ConstantDrift>
default remains, producing the same behavior as old .time(true).
The test_env_ttt Gaussian goldens are updated to reflect the correct
time=true semantics (b.elapsed=2 instead of 1 due to b skipping t=2);
this is a correction: the old !self.time last_time bump was an
implementation quirk that diverged from the Python reference.
55 tests pass. clippy clean. fmt clean.
Part of T2 of docs/superpowers/specs/2026-04-23-trueskill-engine-redesign-design.md.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Anders Olsson
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