List Session Frames

List captured frames for a session, with presigned S3 URLs for the full-res webp and thumbnail.

Designed for post-call agents (e.g. a coding agent given the conversation link) that need to reconstruct the visual context of the call alongside the transcript. Frames are ordered oldest-first by captured_at.

Query params:

• start / end — wall-clock window in seconds (agent clock; same timestamps as the transcript). Both optional.
• limit — max frames to return (default 500, hard cap 2000).
• sources — comma-separated subset of captured frame sources (speaking_tick,motion_spike,turn_end,silent_watch,pointer_trace, etc.).
• user_turn_index — restrict to frames captured during a specific real user turn. Match against transcript[].real_user_turn_index (user rows) or transcript[].responding_to_user_turn_index (assistant rows).

Each frame returns presigned URLs valid for 1 hour. Re-call this endpoint to refresh URLs.