Add Reddit Pilot Real Shape Fixture

The connector fixture scrubber pipeline shipped with two pilot shapes: a browser DOM capture (Amazon) and an API JSON capture (GitHub). Reddit is now the third distinct shape — a records-level JSONL stream emitted directly from runConnector() — and has no committed real-shape fixture. Its integration tests use synthetic listings, which miss drift between the hand-crafted shapes and what Reddit's old-reddit JSON actually serves.

Connectors that emit records directly (JSONL streams without an intermediate DOM or HTTP-JSON shape) SHALL produce their committed pilot fixture through the LLM-assisted structured-redaction mode of the scrubber pipeline. Deterministic regex redaction alone is insufficient for free-form user-authored text in records.