Add recorded sessions section with Session 1 transcript

- Sessions nav tab with index and Session 1 page
- Full whisper-large-v3 transcript (MLX, 59 min, 1174 segments)
- 42 YouTube chapters with timestamps
- Transcript JSON with word-level timestamps

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 0bserver07

docs/sessions/index.md

@@ -0,0 +1,7 @@
+# Recorded Sessions
+
+Video walkthroughs of research, tooling, and experiment workflows.
+
+| Date | Who | Title | Length | Link |
+|------|-----|-------|--------|------|
+| 2026-03-22 | Yad | [Session 1: Weekly catch-up and DMC experiments](sesh-1.md) | ~60 min | [YouTube](https://www.youtube.com/live/L3PamTTQFGk) |