feat: Add Series-inspired methods to Expression#35
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Added missing Series-inspired mathematical, aggregation, cumulative, and utility methods to `leanframe.core.expression.Expression`. This aligns the deferred execution capabilities of `col()` with concrete column operations exposed by `Series`. Methods correctly return a new `Expression` object. Added accompanying unit tests. Co-authored-by: tswast <247555+tswast@users.noreply.github.com>
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Added missing Series-inspired mathematical, aggregation, cumulative, and utility methods to `leanframe.core.expression.Expression`. This aligns the deferred execution capabilities of `col()` with concrete column operations exposed by `Series`. Methods correctly return a new `Expression` object. Added robust unit tests that evaluate the deferred expressions over an ephemeral duckdb backend using `assign` and `to_pandas`. Co-authored-by: tswast <247555+tswast@users.noreply.github.com>
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Improved API coverage for
leanframe/core/expression.pyby adding missing methods such assum,cummax,astype,isin,diff, etc., soExpressionaligns closer withSeries. Added comprehensive test suite.PR created automatically by Jules for task 11915896851504058434 started by @tswast