Anders Olsson a83c9acacb feat(error): expand InferenceError; convert boundary asserts to Result ...

InferenceError gains MismatchedShape (user-input length mismatches),
InvalidProbability (p_draw out of [0, 1]), and ConvergenceFailed
(exceeded max_iter without hitting epsilon). NegativePrecision stays.

History::add_events_with_prior and History::add_events now return
Result<(), InferenceError>. The previous assert! macros checking
composition/results/times/weights shape are replaced by matched
error returns.

Internal debug_assert! macros for arithmetic invariants stay; this
change only affects boundary validation of user input.

Tests updated to call .unwrap() on the Result. The old signatures
will be fully replaced in Task 15 (typed add_events(iter)) and the
nested-Vec wrapper removed in Task 20.

Part of T2 of docs/superpowers/specs/2026-04-23-trueskill-engine-redesign-design.md.

2026-04-24 12:26:13 +02:00

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