Function readSessionTurns

readSessionTurns(
projectDir: string,
sessionId: string,
): AsyncGenerator<MessageEntry>
Streams the main-transcript turns of a session, one at a time.

Yields user and assistant entries from the main JSONL file, in chronological order, skipping subagent turns (isSidechain && agentId !== undefined). Memory stays bounded — the consumer can break, filter, or accumulate at will.
Parameters
- projectDir: string
  Absolute path to the project directory under ~/.claude/projects/<slug>/
- sessionId: string
  UUID of the session (without .jsonl extension)
Returns AsyncGenerator<MessageEntry>
Example
```
// Render a transcript without holding all turns in memory
for await (const turn of readSessionTurns(dir, id)) {
  render(turn);
}
```
- Defined in parser/session.ts:92