fix: fan-out-safe t.all() totals and loud, ownership-based filter pus…

[hussainsultan]

…hdown

Fixes three silent-wrong-answer defects in the join_many pre-aggregation path, found during a soundness evaluation of v0.3.15:

1. t.all(...) totals were built by re-running agg specs on the fanned-out joined table, inflating denominators (percent_of_total summed to 0.5 with 2 line items per order). The pre-agg path now captures each (filtered) source table plus its original measure expressions and passes a lazy fan-out-safe totals builder through _apply_calc_specs → apply_calc_measures(totals_base_builder=...): each table aggregates at zero grain — where fan-out cannot occur — and the one-row results are cross-joined. Correct for sum/count, mean, and count-distinct totals.

2. Filters were silently dropped or mis-pushed. Root cause: _Resolver .getitem ignored the dimension map, so t["orders.status"] raised and the entire filtered-join build collapsed to tbl=None inside a broad except, discarding the filter. Bracket access on _Resolver / _AggResolver now falls back to declared dims/measures (materialized columns still win, preserving post-agg stale-dimension semantics), and pre-agg filter pushdown is ownership-based: each filter resolves against every source table's dims (bare and table-prefixed); it is pushed to a raw table only when exactly one table owns it, ambiguous filters apply through the filtered joined table's key bridge, and a filter handled by neither path raises ValueError instead of being silently ignored. The deferred-join path's filter application and _find_deferrable_joins' reference detection get the same treatment.

3. find_join_in_tree treated the wrapper SemanticTableOp created by SemanticJoin.with_measures()/with_dimensions() as a leaf, so a .filter() between the wrapper and .aggregate() silently skipped pre-aggregation and returned fanned-out sums. The wrapper's _source_join is now followed.

Regression coverage in test_preagg_filters_and_totals.py: totals under uneven 1:N fan (sum and mean), totals with filters, prefixed / bare- ambiguous / single-owner filter pushdown, unresolvable-filter error, and prefixed filters on the join_one path.