Fix integer t.all() totals truncating to 0 on DataFusion

[hussainsultan]

Stacked on #306 (fix/refuse-raw-execute), which surfaced this defect while pinning the surviving agg.mutate spelling.

Problem

model.group_by("carrier").aggregate("total") \
     .mutate(share=lambda t: t.total / t.all(t.total))

returned 0.0 for every share on the memtable → canonical-backend (xorq/DataFusion) path when the measure is integer-typed — silent-wrong, while the identical calc-measure spelling (with_measures(share=...)) was correct and the duckdb-compiled SQL carried a float cast.

Cause

attach_windowed_totals (calc_compiler.py) builds the lifted __bsl_totals__<name> column as agg_expr.over(window()) with the measure's original dtype. For an integer SUM/COUNT measure that column stays int64, and xorq's DataFusion executes ibis truediv on two int64 operands as integer division (60 / 160 → 0), even though ibis types the result float64:

t = xo.memtable({"a": [60, 100], "b": [160, 160]})
t.mutate(r=t.a / t.b).execute()   # r == 0.0, 0.0

The calc-measure path already guards against exactly this via _float_total in MeasureScope.all ("with two integer operands some engines do integer division, and 30/160 came back as 0"); the inline lift missed the same policy.

Fix

Apply the established integer→float64 cast where the totals columns are created:

• attach_windowed_totals casts the windowed total (_float_total, integer dtypes only — non-numeric totals untouched),
• attach_calc_totals casts calc-of-calc totals the same way, so an int-valued calc can't reintroduce the truncation downstream.

Casting the denominator makes the division int/float64, which DataFusion executes correctly (verified: 0.375 / 0.625).

Tests

• New test_integer_ratio_via_aggregate_mutate_is_a_ratio covers integer sum and count measures through the inline lift on the memtable fixture.
• The duckdb pin added in Refuse raw output from definition-side semantic expressions #306 is removed — the inline spelling now asserts SUM_SHARE on the shared memtable → DataFusion path directly.
• Full suite: 1335 passed + 13 integration (Malloy) passed.

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