feat(claude): ConversationWriter writes Claude Code session JSONL - #230
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`ConversationWriter::write_conversation<W: Write>(&conv, w)` writes a conversation in Claude Code session-file layout: preamble lines, then entries, one JSON value per line, newline-terminated. It is the inverse of `ConversationReader::read_conversation`. Records go straight to the sink via `serde_json::to_writer`, so no intermediate String exists. The trailing newline is part of the contract: Claude Code appends to the file on resume, and without it the first appended entry lands on the last line. `p export claude` writes through the new writer; its private serialization loop in cmd_export.rs becomes a three-line adapter that collects the bytes into a String for stdout and --output. Bumps toolpath-claude to 0.12.3 (additive).
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The trailing newline constraint on Claude session files belongs in the crate that owns the format, not in
cmd_export. This adds aConversationWriter::write_conversationtotoolpath-claudeand routesp export claudethrough it.Alternatives considered: a method on
Conversation, rejected becausetypes.rsholds data and infallible accessors only.Discovered this while working on a second caller: #223 (comment)
toolpath-claude bumps to 0.12.3
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