fix: avoid mid-word splits in text_transforms.replace#6439
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`replace` held back a fixed `max(len(key)) - 1` trailing characters on every chunk to catch keys split across streaming boundaries, so ordinary words were emitted split mid-word (e.g. "connect." arrived as "conne" + "ct."). It now buffers only a trailing run that could still start a replacement key and forwards the rest immediately. Substitution uses a single compiled alternation, which also avoids cascading replacements and prefers the longest match on overlapping keys.
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replaceheld back a fixedmax(len(key)) - 1trailing characters on every chunk to catch keys split across streaming boundaries, so ordinary words were emitted split mid-word (e.g. "connect." arrived as "conne" + "ct.").It now buffers only a trailing run that could still start a replacement key and forwards the rest immediately. Substitution uses a single compiled alternation, which also avoids cascading replacements and prefers the longest match on overlapping keys.