Session 16 — Friday Intelligence Tier 3

What was built

Friday Intelligence Upgrade Tier 3 (TB-16 complete) — 6 write-action capabilities
- $5K guardrail owner-exempt: owner bypasses all guardrails in confidence-routing-service
- 20/hr chat rate limit (owner/admin), 10/hr other roles
- modify_schedule direct tool — create, reschedule, cancel site visits through Friday with two-phase preview/confirm
- render_chart Tufte-style — 5 chart types (bar, horizontal_bar, line, sparkline, dot_plot) as inline SVG
- Admin cert direct send through Friday (guardrails = choose send or queue)
- Admin WhatsApp through Friday — send messages to dustin or darius
New services: friday-write-service (preview/confirm pattern, 60s token TTL, audit trail), friday_chart_service.py, friday-voice-service (8 voice configs)