Steps tendency#176
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- Rename is_string -> is_categorical so booleans are treated like strings (held as a zero-order-hold step rather than coerced to float and interpolated) - Reject mixing categorical (string/boolean) and numeric values within a single waveform, since the gaps between them cannot be interpolated - Document the constant tendency value types (float/int/categorical) in the docs
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A piecewise-constant tendency that holds each value from its breakpoint until the next, supporting non-numeric (string/boolean) values. Registered as 'steps'. - start is inferred from the first breakpoint; an explicit end/duration may be given so the final value is held for a real duration (defaults to the last time) - shared time/value validation and start/end resolution are factored out of PiecewiseLinearTendency via overridable _coerce_value / _resolve_time_bounds hooks, so the steps tendency only overrides what genuinely differs
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Includes a commit from #175