Schema migrate kh_km: gt_transcript→human_transcript + canonical 18-col (batch 441-444)

data/kh_km/train-00417.parquet

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+oid sha256:1b703dc4cdb36bd9f34d6914b4a6fb79ac457233c5378b9dfa43f1752dc21ee6
+size 291266

data/kh_km/train-00418.parquet

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+oid sha256:27def252b67f776ee74737c23ed6744e1f5517735dfc761709a792017a1d9267
+size 291940

data/kh_km/train-00419.parquet

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-size 290076
+oid sha256:645bf40b448253055efd1423c977c324dd1d03df66d46b725bc6db2bff1327c8
+size 290265

data/kh_km/train-00420.parquet

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+oid sha256:730e43dc9425562a247d54abb40884cd98bfa47aecd45b32c629709d2048e469
+size 49051