Add rayforce 10M-row scaled harness and queries

[singaraiona]

Iteration-fast subset of the full ClickBench load: 10M rows of hits (~8 GB CSV) loaded in-memory via .csv.read, all 43 queries ported to rayforce expressions under q/, and harness scripts:

bench_rf_mine.sh full 43 queries × 3 reps, min-of-3
benchq.sh load once, run a listed subset of queries
perfq.sh perf record one query, skips ~30s load via -D
capture_rf.sh full REPL output dump for correctness inspection
corr.sh fast 100k-row correctness pass
cmpq.sh side-by-side result diff against the reference run
bench_duck.sh reference engine timings on the same hits.db

hits_h.csv / hits.db are not checked in — gitignored. rf_min.txt / duck_min.txt are the latest min-of-3 timings.

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