Abilty to set up non-OHMS OH chunks for vector search for AI chat#3238

Draft

jrochkind wants to merge 9 commits intomasterfrom

Commits on Dec 22, 2025

extract OralHistoryContent::Paragraph class to represent paragraphs from multiple kinds of transcript sources, for use by chunker
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OralHistory::PlainTextParagraphSplitter
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change name of OhmsLegacyTranscriptChunker to TranscriptChunker because we're going to make it able to handle more things
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refactor transcript chunker to be ready to handle other types of transcripts
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remove fragment and transcript ID from base/plaintext paragraph, actually only relevant to OHMS display
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TranscriptChunker can handle plaintext searchable_transcript_text now
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fix, mutating gsub! does not return receiver
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handle idiosyncratic plain text transcript
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keep going in error condition where there is no speaker name
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