New public query methods on History:
- current_skill(&K) -> Option<Gaussian>: latest posterior for a key
- learning_curve(&K) -> Vec<(T, Gaussian)>: single-key history
- learning_curves() -> HashMap<K, Vec<(T, Gaussian)>>: all-keys history
- log_evidence() -> f64: total log-evidence (was log_evidence(false,&[]))
- log_evidence_for(&[&K]) -> f64: subset log-evidence
- predict_quality(&[&[&K]]) -> f64: draw-probability match quality
- predict_outcome(&[&[&K]]) -> Vec<f64>: 2-team win probabilities
learning_curves() changed from returning HashMap<Index, Vec<(i64, Gaussian)>>
to HashMap<K, Vec<(T, Gaussian)>>. A new learning_curves_by_index()
helper preserves the old Index-keyed shape for callers that ingest via
the pub(crate) Index path.
log_evidence(false, &[]) was renamed to log_evidence_internal and made
pub(crate); the new zero-arg log_evidence() wraps it.
predict_outcome is T2 2-team-only; N-team deferred to T4.
KeyTable::get no longer requires ToOwned<Owned = K> (only needed for
get_or_create), allowing query methods to use simpler bounds.
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>
Third tier of the ingestion API (spec Section 4). Powers one-off
events with irregular shapes where neither record_winner (too
simple) nor typed add_events (too verbose) fits cleanly.
EventBuilder accumulates teams, weights, and outcome. Supports:
- .team([keys]) — add a team
- .weights([w..]) — per-member weights on the most-recently-added team
- .ranking([ranks]) — explicit per-team ranks
- .winner(i) — convenience: team i wins, others tied
- .draw() — all teams tied
- .commit() — finalize into an Event<T, K> and delegate to add_events
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>
Public API gains:
History::add_events<I: IntoIterator<Item = Event<T, K>>>(events)
-> Result<(), InferenceError>
which accepts the typed Event<T, K> shape added in Task 10. Ranks
from Outcome::Ranked are mapped to the legacy "higher f64 = better"
results internally.
add_events_with_prior now takes Vec<T> for times (was Vec<i64>),
generifying the whole internal path over T in a single fully-generic
impl<T: Time, D: Drift<T>, O: Observer<T>, K> block. The i64-specific
block is gone; record_winner/record_draw are now generic over T.
add_events_with_prior stays pub (not pub(crate)) because the ATP
example calls it directly with pre-built Index-based composition;
the new typed add_events is the primary public API going forward.
In-crate tests updated to call add_events_with_prior with an empty
HashMap. tests/api_shape.rs added with 3 integration tests covering
bulk ingest, draw, and mismatched-outcome error.
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>
Spec Section 4 "three-tier event ingestion" tier 2: one-off match
convenience. Spec open question 3: expose Index + intern/lookup for
power users.
History and HistoryBuilder gain a 4th generic parameter
K: Eq + Hash + Clone = &'static str. The default ensures existing
tests using Index-based add_events compile unchanged.
History internally owns a KeyTable<K>. intern(&Q) creates or returns
an Index for the given key; lookup(&Q) returns Option<Index> without
creating. record_winner and record_draw are thin 1v1 wrappers around
the internal add_events_with_prior.
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>
