OpenAI's export changed: conversations.json is now sharded into
conversations-000.json..NNN.json, each a JSON array of conversations with the
mapping tree and per-message create_time.
ingest now reads that format directly (supersedes the old convert/trim/split
scripts): walks each conversation's mapping ordered by create_time, keeps text
and multimodal_text (drops thoughts/reasoning_recap), captures real per-message
timestamps, and imports idempotently by conversation_id. `lyra-import <dir>`
auto-detects raw-export vs legacy {title,messages} dirs; optional limit arg.
Verified on 15 conversations: real dates, correct ordering, recall returns
dated poker history.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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