New binaries for the Session Intelligence Layer. gstack-timeline-log appends
JSONL events to ~/.gstack/projects/$SLUG/timeline.jsonl. gstack-timeline-read
reads, filters, and formats timeline data for /retro consumption.
Timeline is local-only project intelligence, never sent anywhere. Always-on
regardless of telemetry setting.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>