wiki: refresh cascades-tucson (track 4 recovered network/voice docs)

Refresh-mode update. Live Syncro values unchanged (55.75 prepaid hrs, 0 open
tickets as of 2026-06-18). Added the 4 docs recovered in c2e5f4f to sources:
RF/voice optimization session log, network-optimization master plan, phase-1
voice QoS design, and the 2026-06-18 voice-quality diagnostic.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

wiki/clients/cascades-tucson.md

@@ -75,6 +75,10 @@ sources:
   - clients/cascades-tucson/session-logs/2026-06/2026-06-18-howard-cascades-outage-followup-openvpn-printer.md
   - clients/cascades-tucson/session-logs/2026-06/2026-06-18-howard-synology-drive-sync-diagnosis.md
   - clients/cascades-tucson/session-logs/2026-06/2026-06-18-howard-lupesanchez-desktop-trcieja-perf-diag.md
+  - clients/cascades-tucson/session-logs/2026-06/2026-06-18-howard-cascades-rf-voice-optimization-plan.md
+  - clients/cascades-tucson/docs/network/network-optimization-master-plan.md
+  - clients/cascades-tucson/docs/network/phase1-voice-qos-design.md
+  - clients/cascades-tucson/reports/2026-06-18-voice-quality-diagnostic.md
 backlinks:
   - projects/gururmm
   - wiki/systems/uos-server